TechTrim™ Installation

Fastening
Cutting
Joints and Spacing
Finishing
Painting
Damage/Repair
Thermal Expansion Values
One-Piece Corner Trim Installation

Getting Started
TechTrim™ can be used in exterior non-load bearing applications wherever wood is normally used. Since it is not a wood product TechTrim can come in contact with the ground, masonry or concrete without fear of deterioration. TechTrim should be stored off the ground to keep it clean and damage free. To keep it clean and flat, store covered, on a pallet, or over stringers spaced no more than 2' apart. Allow TechTrim to acclimate to jobsite conditions for 24 hours prior to installation.

Fastening
TechTrim can be nailed directly to structural members or applied over siding or other materials. To avoid building in stresses always nail from one end to the other – never nail from both ends to the middle. Use corrosion-resistant nails at least every 16" O.C., making sure the pointed end of the nail penetrates the structural substrate at least 1". Triple nailing is required on boards Standard 10" wide and larger; double nailing is required on narrower boards. 8d galvanized finishing nails are required for hand nailing. 2-1/4" fiber cement siding nails should be used when fastening with a pneumatic nail gun. Refer to the TechTrim Recommended Fastener list for more information. Since TechTrim is a homogeneous polymer with no grain it can be nailed near edges without fear of splitting. If gluing, use an exterior grade non-solvent based construction adhesive.

Fastening One-Piece Corner
5/4x4 one-piece corners should be nailed starting at one end then nailed overthe entire length to the opposite end. One nail should be used on each facewith nail spacing a maximum of 16” on center. Nails should be driven on eachface 1” from the end with additional nails 6” from the end. 5/4x6 one-piececorners should be installed using 2 nails on each face. 8d galvanized box nails are recommended. Nail points must penetrate structural material at least one inch.

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Cutting
Use conventional thin kerf ATB carbide-tipped blades - the fewer teeth, the better. Blades with anti-stick coatings perform best. Cut quickly for best results. (Cutting slowly may cause the product to melt due to prolonged friction.) Normal woodworking tools and equipment can be used to rout, mill and drill the edges and face of TechTrim. Ripping, rabbeting, moulding or routing will not affect its integrity, but small core voids may be exposed and may not be desirable for certain applications. Always paint any exposed surfaces with a quality exterior latex paint.

Joints and Spacing
TechTrim does not expand or contract due to moisture absorption but temperature variations will affect it. Width and thickness changes are negligible but some longitudinal changes due to large temperature swings must be allowed for. Fastening at closer intervals will reduce thermal movement.

All butt joints must be spaced appropriately! A gap must be left between board ends and meeting surfaces to allow for expansion due to temperature changes. Refer to the temperature range on the quick reference list for the ambient temperature on the day TechTrim is being installed. Leave the corresponding gap listed for the temperature range between board ends or meeting surfaces.

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Temperature Range Quick Reference List

Figure 1
TechTrim Exterior Trim Board - Installation Assistance - Spacing
Scarf Ends
Outdoor Temp at Installation   End Gap to Leave Between Meeting Surfaces
<40°F
=
1/4"
41 - 60°F
=
3/16"
61 - 100°F+
=
1/8"

Example: You are installing TechTrim and the outdoor temperature is 58°F. 58 falls in the 41-60° range. The corresponding gap indicated is 3/16". A 3/16" gap is required between board ends and meeting surfaces on a day when the temperature is 58° F. (Additional gap details can be found in the Thermal Expansion Values table below.) Where the ends of two TechTrim pieces meet, scarfing the ends at 45 degrees (see Fig. 1) and allowing a properly sized gap is required to create the butt joint. All gaps must be filled with a premium, quality flexible acrylic sealant, color matched or paintable at the time of installation. Apply caulk to the end of one board, then press the second board to the first, to evenly distribute the caulk and fill the gap between the two pieces. Double nail 1" and 6" from the end of each board. Triple nail 10" to 12" wide pieces. Remember to double nail 4" to 8" wide material 16" O.C. maximum the entire length of the piece.

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Finishing
For a good finished appearance countersink all fasteners and fill with a high quality water-based exterior wood patch before the finish coat of paint is applied.

Painting
TechTrim is primed in the factory and covers in one to two coats of latex paint. Choose a high quality water-based exterior paint and apply it within 90 days of installation. Solvent-based paints such as oil or alkyd is not recommended. Always paint any surfaces exposed due to cutting or milling.

Damage/Repair
Most surface damage can be filled and touched up with matching exterior caulk, filler and/or paint. Scrapes and scratches can be removed with sandpaper.

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Thermal Expansion Values

Inches of expansion-contraction for specific lengths and temperature changes
Double-nailed with minimum 8d nails
(diameter equal to or greater than .0113 inches),16"OC
Material Length
Temperature Change (°F)
Ft. In. 10 20 30 40 50 60 70 80 90 100
0.5 6 0 0 0 1/128 1/128 1/128 1/128 1/128 1/128 1/128
6 72 1/64 1/32 1/32 1/16 1/16 3/32 3/32 1/8 1/8 1/8
8 96 1/64 1/32 1/16 1/16 3/32 1/8 1/8 5/32 5/32 3/16
10 120 1/64 1/32 1/16 3/32 1/8 1/8 5/32 3/16 7/32 7/32
12 144 1/32 1/16 3/32 1/8 1/8 5/32 3/16 7/32 1/4 9/32
16 192 1/32 1/16 1/8 5/32 3/16 7/32 1/4 9/32 11/32 3/8
18 216 1/32 3/32 1/8 5/32 7/32 1/4 9/32 11/32 3/8 13/32

Decimal equivalent 0.0000193 inches expand/contract per inch of material per °F

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TechTrim One-Piece Corner Board Installation Instructions

Fastening One-Piece Corner
5/4x4 one-piece corners should be nailed starting at one end then nailed over the entire length to the opposite end. One nail should be used on each face with nail spacing a maximum of 16” on center. Nails should be driven on each face 1” from the end with additional nails 6” from the end. 5/4x6 one-piece corners should be installed using 2 nails on each face. 8d galvanized box nails are recommended. Nail points must penetrate structural material at least one inch.

One-Piece Corner Joints and Spacing
For corners taller than 10’, sections of TechTrim one piece corner can be stacked on top of one another as necessary. Leave the ends square cut. Gap the space where pieces meet according to the Temperature Range Quick Reference List. Be sure to leave an expansion gap at the bottom and the top of the corner. Fill all joint gaps with a premium quality flexible acrylic sealant, color matched or paintable.

For more information, please call 877-463-8379.

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TechTrim Exterior Trim Board