JELD-WEN MiraTEC Smooth Select 4/4 Trim Board

MiraTEC Smooth Select 4/4 trim delivers 9x more durability than hardboard or OSB trim with a 50-year warranty backing for Montana’s extreme conditions. The TEC sealed-press wood composite combines northern hardwoods (maple, beech, oak) with phenolic resin and zinc borate treatment. At 3/4” actual thickness, it handles like wood but resists moisture, rot, and termites in ways cedar can’t match.

Skip it for structural applications. This is non-structural decorative trim only. If you need load-bearing capacity or direct ground contact, look elsewhere.

Dimensional Specifications and Weight Data

The 4/4 boards measure 3/4” actual thickness (1” nominal). Width options span the full range contractors need:

Nominal Width	Actual Width	Weight (16 ft)
2”	1.5”	—
3”	2.5”	—
4”	3.5”	18.21 lbs
5”	4.5”	—
6”	5.5”	—
8”	7.25”	—
10”	9.25”	—
12”	11.25”	58.68 lbs
16”	15.5”	—

Standard lengths run 16 feet (192 inches). Some dealers stock 8-foot lengths — handy for smaller jobs and reducing waste on window trim.

The material is uniform density throughout — single solid piece with no laminations or finger-joints. That’s why it won’t delaminate like hardboard-based products. The weight tells you it’s substantial material. A 12” fascia board at nearly 60 pounds requires two people on ladders.

Installation Requirements and Fastening Specifications

The fastener rules matter for warranty coverage. Use hot-dipped galvanized or stainless steel fasteners with 1-1/4” minimum penetration into structural wood. 6d or 8d 15-gauge finish nails work best.

Critical spacing requirements:

• Keep fasteners at least 1/2” from any edge
• Set nails flush or slightly countersunk (maximum 1/8”)
• Edge nailing is prohibited
• Double nail 16” on center for horizontal/vertical applications

Additional installation specs from the technical documentation:

Application	Fastening Pattern
Batten (2” product)	Single nails 12” on center, staggered
4/4 and 5/4 fascia/soffit	Double nailed maximum 24” on center to rafter ends
5/8 fascia/soffit	Nailed 16” on center to rafter ends or sub-fascia

Clearance requirements protect the material:

• 6” minimum clearance to finished grade
• 1/4” gap at windows
• 1” minimum between roofing and bottom edge of trim
• 1/2” spacing from concrete flatwork

Factory priming covers all sides, but you’ll need to re-prime any scuffs with high-quality oil-based primer. Prime cut or raw edges within 30 days of installation. Apply two coats of paint within 90 days.

Performance Testing and Durability Metrics

The testing data backs up the durability claims:

Test Category	Standard	Result
Moisture resistance	ASTM D1037	Water absorption and thickness swelling tested
Rot resistance	AWPA E16	Horizontal Lap-Joint Method tested
Termite resistance	AWPA E7	Field method tested
Fire rating	—	Class C

In head-to-head weatherability tests against LP SmartSide, MiraTEC showed less residual swell after exposure to seasonal weather cycles. The EPA-registered zinc borate treatment provides termite protection — not a huge Montana concern but reassuring for crawlspace applications.

Environmental certifications add credibility:

• ICC-ES ESR-3043 — first wood-composite trim to receive this evaluation
• SCS Global certification for no added urea-formaldehyde
• GREENGUARD Gold certified for low chemical emissions

The 50-year limited warranty covers hail damage, delamination, fungal decay, termite damage, splitting/cracking, buckling, and excessive warping or swelling. That’s real coverage for Montana’s hail events and freeze-thaw cycles. You must install per manufacturer instructions and maintain the primer.

Compared to cedar, you get no knots, no warping, splitting, or checking, plus superior dimensional stability. Against PVC, MiraTEC costs less and doesn’t expand/contract like plastic — no crackling or thermal movement issues, and you can paint it any color including dark shades.

The bottom line? MiraTEC delivers measurable durability improvements over traditional trim materials. The specs prove it handles Montana’s climate extremes. Just remember it’s decorative trim only — no structural loads, no ground contact. For fascia, corner boards, window trim, and protected applications, it’s engineered to last.

FAQ

What sizes does MiraTEC Smooth Select 4/4 trim come in?

The 4/4 boards measure 3/4” actual thickness. Widths range from 2” to 16” nominal (1.5” to 15.5” actual). Standard length is 16 feet, with 8-foot lengths available through some dealers.

What type of nails should be used with MiraTEC trim?

No. You must use hot-dipped galvanized or stainless steel fasteners. Avoid electro-galvanized nails. 6d or 8d 15-gauge finish nails are recommended. Fasteners need 1-1/4” penetration into structural wood.

Does MiraTEC Smooth Select need painting?

Yes. While factory-primed on all four sides with low-VOC, mildew-resistant primer, you still need topcoats. Apply two coats of paint within 90 days of installation. Finish with high-quality exterior acrylic latex or oil-based paint.

How much weight can MiraTEC trim support?

None. This is a non-structural decorative trim product. It’s designed for appearance applications only — fascia, corner boards, window trim. Don’t use it where structural support is needed.

What’s the actual warranty coverage on MiraTEC?

50-year limited warranty that’s transferable. It covers hail damage, delamination, fungal decay, termite damage, splitting/cracking of the face, buckling, and excessive warping or swelling. You must install according to manufacturer instructions and maintain the primer.