Frequently Asked Composite Decking Questions

General Decking FAQs

• What span should I use between joists?
• Do you supply timber joists?
• Can I build a TimberTech deck directly onto my flat roof terrace?
• Do I butt joint boards tight to the next board?
• Is TimberTech decking material child friendly?
• How will saltwater effect TimberTech decking?
• Will TimberTech decking and railing fade in colour?
• Are TimberTech decking products environmentally friendly?

Decking FAQs

• What kind of fastener should I use with TimberTech decking?
• Can I build my TimberTech decking directly over an existing concrete or paved area?
• Can I cantilever TimberTech boards on my decking?
• Can I use glue or caulk with TimberTech decking?
• Can I install my hot tub on top of my TimberTech decking?
• Can I use a router on the TimberTech decking?
• Can TimberTech decking be painted or stained?
• Do I have to leave a wider joint on butt joints?

Railing Railing FAQs

• My RadianceRail components appear to be two different shades, what should I do?
• Are the RadianceRail kits actually a full 2.4m length?
• I have a chip in the cap stock (outer layer) material on my RadianceRail - can I repair it or touch it up?

Decking Lighting FAQs

• Can I submerge DeckLites in my pool, fountain or pond?
• Can I use any 12-volt lamp with my fixtures?
• How does cable size affect the transformer?
• What happens if you are under 12V?
• Why do DeckLites not have a 'Clip and Go' system for attaching the wiring together?
• Are replacement bulbs available for DeckLites?
• What is voltage drop?
• What is the maximum length of cable I can attach to my transformer?
• Why are my lights dim at the end of the run?
• How do you check the transformer for proper voltage?
• Why do all my lights blink on and off continuously?
• How many lights can I have on one150w TimberTech transformer?
• Are low-voltage lights safe around children and pets?
• What happens if you are over 12V?
• What does the statement 'First fixture must be 10 feet from transformer' mean and why?
• Can I add a photocell and timer to my TimberTech transformer?
• Is there a positive or negative in the wires or cables?
• Can you connect a transformer to an electrical outlet with an extension cord?
• Should transformers be used to their full capacity?
• Why does my circuit breaker keep tripping?
• How close can I install low-voltage lighting fixtures to my swimming pool?
• What is a multi-tap transformer?
• Can TimberTech transformers be installed indoors?

DrySpace FAQs

• Will the DrySpace Combo Bracket or Joist Cover cause my decking to rot?
• Can I paint DrySpace?
• Can I splice panels together to save material?
• Can I install a more decorative ceiling under DrySpace?
• Could I install DrySpace by using F-Brackets only and not the Combo Bracket (Joist Cover/F-Bracket combo)?
• Can I run the Panels over the top of a beam?
• I have a support beam 3' from my house. Can I run the Panels over the top of the beam?
• Will chemical treatments or stains damage DrySpace?
• My decking was constructed with pitch away from the house. Can I install the Joist Covers tight to the bottom of the joist?
• Can I install DrySpace by myself?

Decking Accessories FAQs

• Do I need to gap my decking when I'm using CONCEALoc Hidden Fasteners?
• What tools are required to install the CONCEALoc Hidden Fasteners?
• What are the CONCEALoc Hidden Fasteners made of?
• Can CONCEALoc Hidden Fasteners be used on angles?
• Is it possible to replace a board installed with CONCEALoc Hidden Fasteners, if it gets damaged after installation?

Care and Cleaning FAQs

• What can be used to clean spot stains such as oil, grease and other stains from decking?
• What can be done to remove scratches, nicks, cuts and grooves from my TimberTech decking?
• What can be used to clean rust, ground-in dirt and grime from my TimberTech decking?
• What can I do to remove ice and snow from my TimberTech decking?

General Decking Answers Back to top

Q: What span should I use between joists?
A: On VertiGrain profile we typically recommend a 400mm maximum width between centres of timber joists.

Q: Do you supply timber joists?
A: Not generally. Most of our customers usually arrange delivery through a local builders merchant.

Q: Can I build a TimberTech deck directly onto my flat roof terrace?
A: Yes is the easy answer , firstly take advice about the suitability & strength of your structure from a qualified person & then determine what method of construction has been used , for solid wood or concrete slab roofs with a mineral finish use our EasyFix shoes to position the joists. For a Mastic Asphalt roof use our our roof tiles underneath the EasyFix to spread the load preventing any point loading, both products will raise the joists above any standing water, prolonging their life while also acting as sound precussion.

Q: Do I butt joint boards tight to the next decking board?
A: No, the butt joints should be positioned in conjunction with recommendations contained in the installation guide to allow the decking boards to expand or contract with temperature variations.

Q: Is TimberTech decking material child friendly?
A: Yes our decking does not splinter or rot and is known for its slip resistant properties, therefore, TimberTech decking boards are extremely child friendly friendly while our 3mm gapping requirement reduces the chance of little fingers getting trapped.

Q: How will saltwater effect TimberTech decking?
A: Saltwater climates are a perfect application for TimberTech decking products. Salt water will have no ill effects on TimberTech decking.

Q: Will TimberTech decking and railing fade in colour?
A: Yes. Expect to loose about 10% of colour density within the first 4 months. All decking materials exposed to weathering effects will fade. TimberTech decking and railing solutions are blended with high quality raw material and UV-inhibiting pigments to minimize fade and produce decking products consistent in colour.

Q: Are TimberTech decking products environmentally friendly?
A: Yes. Because TimberTech decking will not splinter, warp or fade in the way wood does, it dramatically reduces the wasteful cycle of repair and replacement and eliminates the frequent application of environmentally harmful paint, sealers and stains. TimberTech decking boards are manufactured with recycled wood materials that would otherwise go into landfills. In addition, TimberTech is able to introduce scrap decking back into the manufacturing process. TimberTech recycles water during the decking manufacturing process. Unlike wood, TimberTech decking is a one-time purchase for most homeowners, with a 25-year warranty.

Decking Answers Back to top

Q: What kind of fastener should I use with TimberTech decking?
A: For installing TimberTech solid decking boards, we recommend Trapease screws that are colour matched to the decking board. TimberTech grooved boards are installed using the TimberTech CONCEALoc^® Hidden Fastener. Follow the directions on the CONCEALoc^® box or bucket.

Q: Can I build my TimberTech decking directly over an existing concrete or paved area?
A: See below for minimum space requirements for your TimberTech decking boards:

VertiGrain and Earthwood EasyClean decking boards
A: There must be a minimum of a 50mm joist system supported by substrate over which the decking is to be built. We recommend using our EasyFix joist shoes. You will require 8 per m².

Q: Can I cantilever TimberTech boards on my decking?
A: Yes. TimberTech Earthwood EasyClean and VertiGrain decking boards can be cantilevered 25mm over the last support.

Q: Can I use glue or caulk with TimberTech decking?
A: Do not use caulk to fasten or fill any gaps in any board product. This will impede the drainage of the decking board and inhibit the natural expansion and contraction. Some contractors have reported success with construction adhesive to support the fastening of other decking boards, but it is not recommended as the primary means of fastening the decking boards or fascia. Again, do not use caulk to seal between the decking boards.

Q: Can I install my hot tub on top of my TimberTech decking?
A: No. The spa must sit on suitable joists or concrete and then the deck boards can be fastened around the spa.

Q: Can I use a router on the TimberTech decking?
A: Yes. If you are installing a solid decking such as our Earthwood EasyClean, VertiGrain, or TwinFascia a router can be used. These TimberTech products will route similar to wood. TimberTech offers a CONCEALoc^® Router Bit to cut the perfect groove in TimberTech Solid boards to use our CONCEALoc^® hidden fastener clips.

Q: Can TimberTech decking be painted or stained?
A: Although not recommended, TimberTech decking may be painted or stained. TimberTech can not guarantee the performance of anything applied to your decking and of course once painted or stained you are back to a regular maintenance program again.

Q: Do I have to leave a wider joint on butt joints?
A: Yes, you should install in accordance with our installation guide to allow for thermal expansion along the decking board’s length.

Decking Railing Answers Back to top

Q: My RadianceRail components appear to be two different shades, what should I do?
A: The two support rails within the kit could appear lighter or darker than the balance of the components. When assembled, these support rails will not be visible so you can proceed with assembling your rails.

Q: Are the RadianceRail kits actually a full 2.4m length?
A: Yes. BUT the actual length of the railing assembly must be measured from centre of post to centre of post. The additional material is provided to allow for angles and end cuts/trimming.

Q: I have a chip in the cap stock (outer layer) material on my RadianceRail - can I repair it or touch it up?
A: Yes. Automotive touch-up paint such as Duplicolor 2 in 1 Scratch Fix works well and is available at most department or automotive retailers. For Coastal White use universal gloss white and for Classic Black use universal flat black.

Decking Lighting Answers Back to top

Q: Can I submerge Decklites in my pool, fountain or pond?
A: No. Landscape lighting must not be used for this purpose. Use only a system listed for use as submersible fixtures, not DeckLites fixtures.

Q: Can I use any 12-volt lamp with my decking lighting fixtures?
A: For best results, use the lamp recommended by the manufacturer. Take care not to exceed the fixture lamp wattage rating.

Q: How does cable size affect the transformer?
A: Just like water through a pipe, the larger the cable (number of copper strands), the greater the flow of electricity. If your cable is not rated properly, the transformer will not perform efficiently. Here is a basic guideline: 12/2 cable is rated at 16 amps or 192 watts, 10/2 cable is rated at 24 amps or 288 watts, and 8/2 cable is rated at 32 amps or 384 watts. Do not exceed the rating of the cable.

Q: What happens if you are under 12V?
A: For every volt under 12V, you lose light output. Under 10.5V, the lights become very dim

Q: Why do DeckLites not have a "Clip and Go" system for attaching the wiring together?
A: Piercing connectors (aka: Clip and Go) are vulnerable to incorrect installation (improper piercing) and/or long-term oxidation resulting in loss of performance. Wire nuts have better long-term reliability than insulation piercing connectors and are commonly used in professionally installed electrical systems.

Q: Are replacement bulbs available for DeckLites?
A: Replacement bulbs for DeckLites can be ordered directly from TimberTech.

Q: What is voltage drop?
A: Voltage drop is caused by the electrical resistance of the cable, which restricts the flow of electricity. The smaller the cable size and the more lights used, the lower the light output will be along the cable. When voltage drop occurs, you may experience insufficient light output, particularly with the lights farthest away from the transformer. Voltage drops can be minimized by switching to a lower gauge of cable.

Q: What is the maximum length of cable I can attach to my transformer?
A: Follow the 50-foot rule: no more than 15m (50 feet) between your first and last fixture. Longer runs of cable can result in lower light output near the end of the cable; therefore, you should use heavier cable or shorter runs to ensure maximum light output. Most important, you must never use cable that is smaller than that listed in the table for your transformer.

Q: Why are my lights dim at the end of the decking run?
A: The greater the distance between the transformer and the fixture, the greater the voltage drop. Follow the 50-foot rule: no more than 15m (50 feet) between your first and last fixture.

Q: How do you check the transformer for proper voltage?
A: The best way to check for proper voltage is with a volt-metre.

Q: Why do all my decking lights blink on and off continuously?
A: The transformer is overloaded. It automatically cycles to prevent overheating. Make sure the total lamp watts do not exceed the transformer rating. Since high wattage replacement bulbs may have been installed, you may need to examine each bulb instead of using the wattage marked on the fixture.

Q: How many decking lights can I have on one 300W TimberTech transformer?
A: You may have a maximum of 30 (10-watt) lights per transformer. If you need additional lights you will need to purchase a second transformer.

Q: Are low-voltage decking lights safe around children and pets?
A: Yes. Low-voltage lights are safe. Since they operate on 12-volt electrical current as compared to conventional 120-volt systems, there is no fear of shock. In fact, the system may be installed with the transformer turned on so that lights can be tested as they're connected.

Q: What happens if you are over 12V?
A: If your circuit operates over 12V (with a multi-tap transformer), you will run the risk of voltage overload and diminish the rated life of the bulb.

Q: What does the statement "First fixture must be 3m (10 feet) from transformer" mean and why?
A: You must have at least 3m (10 feet) of cable between the first fixture and the transformer to avoid premature bulb burn out. The cable may be buried, but coiling must not be done.

Q: Can I add a photocell and timer to my TimberTech transformer?
A: The TimberTech transformer already contains a photocell and timer for your convenience.

Q: Is there a positive or negative in the wires or cables?
A: Yes. There is polarity in the wiring. Refer to our Installation Resources for complete details on wiring your deck and loop system.

Q: Can you connect a transformer to an electrical outlet with an extension lead?
A: No. It must not be done.

Q: Should transformers be used to their full capacity?
A: Yes. As the load decreases, the output voltage of the transformer increases. Therefore, the life of low-voltage lamps will be shortened unless the transformer is carrying close to its rated capacity. The rule of thumb is to use at least half the transformer's wattage rating.

Q: Why does my circuit breaker keep tripping?
A: Make sure that the circuit breaker amperage is suitable for the transformer. At times, there might be multiple appliances connected to the same breaker causing an overload.

Q: How close can I install low-voltage decking lighting fixtures to my swimming pool?
A: For maximum safety, the lights and cables are UL approved to be installed not less than 3m (ten feet) from the edge of the pool. The transformer must be equipped with a ground shield. Your TimberTech transformer has a ground shield.

Q: What is a multi-tap transformer?
A: A multi-tap transformer has multiple voltage tap options to offset voltage drop. Multi-tap transformers generally are offered in 12-15V options. TimberTech's 300W, 12-volt transformer has a 12V, 13V, 14V and 15V tap.

Q: Can TimberTech transformers be installed indoors?
A: No. Transformers are listed as outdoor products only.

DrySpace Answers Back to top

Q: Will the DrySpace Combo Bracket or Joist Cover cause my deck to rot?
A: No. When properly installed the Combo Bracket or Joist Cover channels water away from the house and out of the Combo Bracket or Joist Cover. This also allows for airflow between the Combo Bracket or Joist Cover and joist.

Q: Can I paint DrySpace?
A: We would not recommend it because of the maintenance issues, but yes DrySpace can be painted.

Q: Can I splice panels together to save material?
A: No. There is no way to make a joint between the Joist Covers and/or Panels that will prevent leaks. DrySpace comes in 3.6m and 4.8m lengths that allow for seamless installations. The 4.8m kits are ideal for DrySpace installations where the joist cavities are 2.4m long.

Q: Can I install a more decorative ceiling under DrySpace?
A: No. That would require penetrating the Joist Covers with nails or screws.

Q: Could I install DrySpace by using F-Brackets only and not the Combo Bracket (Joist Cover/F-Bracket combo)?
A: No. The Combo Bracket (Joist Cover/F-Bracket Combo) must be used to collect any water that drains through or around the joist.

Q: Can I run the Panels over the top of a beam?
A: Panels must always stop 75mm from the beam. In most cases the low point of the Panel will interfere with the beam causing water to dam on the Panel. Combo Brackets and Joist Covers should stop 25mm from the beam. For more information on beams, refer to our Installation Instructions.

Q: I have a support beam 75mm from my house. Can I run the Panels over the top of the beam?
A: While the Panels would clear the beam 75mm from the house, the Joist Covers must terminate at the beam. The Panels should also be trimmed at this point. Because the Joist Cover is a gutter any water that drains from the Joist Covers should be collected with a K-style gutter.

Q: Will chemical treatments or stains damage DrySpace?
A: No. Common, off-the-shelf stains and chemical wood cleaning treatments have no adverse effects on DrySpace.

Q: My decking was constructed with pitch away from the house. Can I install the Joist Covers tight to the bottom of the joist?
A: No. The Combo Bracket and Joist Cover is a gutter that does collect water. When the Combo Bracket or Joist Cover is installed tight to the bottom of the joist, water cannot freely flow from the Combo Bracket or Joist Covers.

Q: Can I install DrySpace by myself?
A: Yes. Complete, easy-to-follow instructions come with your DrySpace purchase or you can refer to our Online Installation Resources. Installation is easiest with two people. You are likely to have the tools and materials you need, or they are easy to find at your local DIY shop.

Accessories Back to top

Q: Do I need to gap my boards when I'm using CONCEALoc Hidden Fasteners?
A: The CONCEALoc fasteners provide consistent spacing between the sides of the boards. You will need to gap the ends at all butt joints per our Installation & Maintenance Guide, which can be found in the Installation Resources section of our Web site.

Q: What tools are required to install the CONCEALoc Hidden Fasteners?
A: No special tools are required when using TimberTech grooved boards - just a drill/driver. We provide a #1 square drive bit with the screws and CONCEALoc clips. If using TimberTech solid boards, a router with TimberTech's CONCEALoc router bit will be needed to create a groove at each joist. You can find complete details on how to install CONCEALoc in grooved and solid boards in TimberTech's online Installation Resources.

Q: What are the CONCEALoc Hidden Fasteners made of?
A: The CONCEALoc fasteners are made from .060 304 stainless steel. This material, with its high nickel content, will ensure a long life even in harsh environments.

Q: Can CONCEALoc Hidden Fasteners be used on angles?
A: Yes. Any angle up to 45 degrees can be achieved. On angles; offset the centre of the fastener ½” towards the long point of the joist, so the screw will not exit the side of the joist when driven. Reference our Installation Resources for additional details.

Q: Is it possible to replace a board installed with CONCEALoc Hidden Fasteners, if it gets damaged after installation?
A: Yes. You can find complete details on how to do this in the TimberTech Online.

Decking Care and Cleaning Answers Back to top

Q: What can be used to clean spot stains such as oil, grease and other stains on decking?
A: Oil Eater^® Cleaner and Degreaser is very effective against oil, grease and other stains on decking. For extra heavy oil and grease stains or other specific stain types, check with your local DIY and hardware stores for cleaners applicable to a specific stain type. On TimberTech decking (except Earthwood EasyClean, Ornamental Rail and RadianceRail), if stains have set you may want to use a fine sandpaper and sand lightly, following the wood grain finish of the board. The sanded area will weather back in approximately 8-10 weeks.

Q: What can be done to remove scratches, nicks, cuts and grooves from my TimberTech decking?
A: For all TimberTech decking products (except Earthwood EasyClean decking, RadianceRail and Ornamental Rail) scratches, nicks, cuts and grooves can be eliminated by using a wire brush. Brushing will need to be consistent with the grain of the decking.

For Earthwood EasyClean decking, surface scratches and abrasions will fade after weathering. Once the decking has fully weathered, it is more resistant to visible scratching. For minor decking scratches, you can use a soldering iron to melt and return the scratch back to the original colour. Try on a sample piece of decking first. Use soldering iron with caution.

Q: What can be used to clean rust, ground-in dirt and grime from my TimberTech decking?
A: Use a cleaner that contains Phosphoric Acid or Oxalic Acid. TimberTech recommend Corte Clean® Deck Cleaner call 029 2037 1584 to buy direct.

If the stains have set on your TimberTech decking products (except Earthwood EasyClean, and the RadianceRail and Ornamental Rail Systems), you may use fine sandpaper and sand lightly followed by a wire brush to re-grain the decking (this applies to brushed surfaces only). Always follow the wood grain finish. The sanded area will weather back in approximately 8-10 weeks but can vary depending on location and specific application.

Q: What can I do to remove ice and snow from my TimberTech decking?
A: If you reside in a cold weather climate where ice and snow periodically come in contact with your decking, use calcium chloride or rock salt to melt the ice and snow.