Mitten›LP® SmartSide®

LP® SmartSide® Engineered Wood Siding

Name: Exterior Pro Materials
Address: Unit 5, 1235 Journey's End Cir, Newmarket, ON, L3Y 8T7, CA
Telephone: +1 (905) 836-7272

LP® SmartSide® Engineered Wood Siding delivers the authentic warmth and grain of cedar — engineered to last longer, perform better, and go up faster than traditional wood or fiber cement alternatives. LP's proprietary SmartGuard® process treats every board to the core with zinc borate, providing factory-assured protection against fungal decay and termites that no field-applied treatment can match.

With 16-ft boards in both 38-Series and 76-Series lap profiles, LP SmartSide creates up to 33% fewer seams than 12-ft fiber cement, reducing installation time and points of potential moisture entry. The system is completed by LP SmartTrim® — available in 440-Series and 540-Series profiles in seven widths — which cuts with standard tools and carries the same SmartGuard® protection. All products are pre-primed and ready to paint any colour on-site.

Backed by a 50-year prorated limited warranty with 100% material and labour coverage for the first 5 years, plus an industry-unique hail damage warranty, LP SmartSide is the premium engineered wood choice for Canadian and North American residential construction.

0.315 in. (38-Series) · 0.375 in. (76-Series) · 0.625 in. (440-Series) · 0.910 in. (540-Series)

Request a Quote Datasheet

Warranty50-Year Prorated Substrate · 5-Year 100% Material & Labour · Hail Damage Limited Warranty

About LP® SmartSide® Engineered Wood Siding

LP® SmartSide® Engineered Wood Siding combines the beauty and warmth of real wood with engineered performance. It is built from wood strands treated with LP's proprietary SmartGuard® zinc borate process, which carries protection against fungal decay and termites through to the core rather than leaving it on the surface.

Boards run 16 ft, so a wall takes up to 33% fewer seams than the same wall in 12-ft fibre cement, and the deep cedar wood-grain texture is pressed rather than printed. LP states the product has been installed on over 4 million homes since 1997 with no documented decay claims, and publishes impact testing in which it outperforms fibre cement under equivalent projectile conditions.

Boards arrive pre-primed and ready to paint any colour. No special tools are needed to cut it, and LP SmartTrim® works with standard carpentry tools.

Available at Pro Materials in Newmarket, Ontario, supplying contractors, builders, and homeowners across York Region, the GTA, and Ontario. All products are available on a quote basis; contact us for wholesale pricing and current availability.

Key Features

SmartGuard® zinc borate treatment — decay and termite protection to the core
NASA-tested impact resistance — outperforms fiber cement
16-ft boards — up to 33% fewer seams than 12-ft fiber cement
Deep authentic cedar wood-grain texture
Pre-primed and ready to paint any colour
No special tools required for cutting LP SmartTrim®
50-Year Prorated Warranty + 5-Year 100% Material & Labour coverage
Hail Damage Limited Warranty (hail up to 1.75 in. diameter)
ICC-ES ESR-1301, APA PR-N124, HUD-MR-1318, CCNC 11826 code recognition
SFI-certified sustainable wood fiber; no added urea-formaldehyde
Over 4 million homes installed since 1997 — zero documented decay claims
Green building points: LEED, NGBS, EarthCraft, BuiltGreen Canada

At a Glance

Warranty: 50-Year Prorated Substrate · 5-Year 100% Material & Labour · Hail Damage Limited Warranty
Material: Treated Engineered Strand (SmartGuard® zinc borate process)
Brand: Mitten
Category: Engineered Wood & Fiber Cement

Installed cost in Ontario, 2026

$9 to $14CAD per square foot

Engineered wood siding, supplied and installed

Primed board such as LP SmartSide adds a first paint coat on top of this range. Prefinished CanExel does not.

See the cost breakdown

Installed range published by Ontario contractors and collected in our LP SmartSide and CanExel: What Engineered Wood Siding Warranties Really Cover (2026). It covers material and labour together. Pro Materials supplies the material, so this is not our quote: request a quote for supply pricing on this product.

Profiles & Specifications

3838-Series Cedar Texture Lap Siding

The 38-Series Cedar Texture Lap uses LP's Treated Engineered Strand substrate — the thinner, lighter profile in the LP SmartSide lap lineup. Deep authentic cedar wood-grain texture on the face. Each 16-ft board reduces on-site seams by up to 33% compared to 12-ft fiber cement alternatives. Pre-primed and ready to paint any colour. Maximum stud spacing 16 in. O.C.

Length	16 ft (4,877 mm)
Available Widths	5.84 in. (148 mm) · 7.84 in. (199 mm) · 11.84 in. (301 mm)
Nominal Thickness	0.315 in. (8 mm)
Substrate	Treated Engineered Strand
Texture	Deep cedar wood-grain
Max Stud Spacing	16 in. (406 mm) O.C.
Minimum Lap	1 in. overlap required
Fastener	Min 6d hot-dipped galvanized nail; 0.091 in. shank, 0.200 in. head
Finish	Factory pre-primed; field paint required within 180 days

7676-Series Cedar Texture Lap Siding

The 76-Series Cedar Texture Lap is LP SmartSide's premium lap siding profile — thicker and stronger than the 38-Series with the same deep authentic cedar wood-grain texture. Engineered Strand substrate delivers superior impact resistance (NASA-tested) versus fiber cement. At 16 ft, boards minimize seams. Maximum stud spacing 24 in. O.C. for engineering versatility.

Length	16 ft (4,877 mm)
Available Widths	5.84 in. (148 mm) · 7.84 in. (199 mm) · 11.84 in. (301 mm)
Nominal Thickness	0.375 in. (10 mm)
Substrate	Treated Engineered Strand
Texture	Deep cedar wood-grain
Max Stud Spacing	24 in. (610 mm) O.C.
Minimum Lap	1 in. overlap required
Fastener	Min 8d hot-dipped galvanized nail; 0.113 in. shank, 0.297 in. head; min 1-1/2 in. framing penetration; max 12 in. O.C.
Finish	Factory pre-primed; field paint required within 180 days

440440-Series Cedar Texture Trim

The 440-Series Cedar Texture Trim (LP SmartTrim®) is LP's most popular trim profile — available in seven widths from 1.5 in. to 11.21 in. Treated Engineered Strand substrate. Same deep cedar wood-grain texture as the lap siding for a seamless, coordinated appearance. Can be cut without special tools. Pre-primed. Compatible with all LP SmartSide siding systems.

Length	16 ft (4,877 mm)
Available Widths	1.50 in. · 2.50 in. · 3.50 in. · 5.50 in. · 7.21 in. · 9.21 in. · 11.21 in.
Nominal Thickness	0.625 in. (16 mm)
Substrate	Treated Engineered Strand
Texture	Deep cedar wood-grain (also available reversible cedar/smooth in Fiber substrate)
Fastener	Min 8d hot-dipped galvanized nail; 0.113 in. shank, 0.270 in. head; min 1 in. framing penetration
Butt Joint Gap	Min 3/16 in. — seal with ASTM C920 Class 25 sealant
Finish	Factory pre-primed; field paint required within 180 days

540540-Series Cedar Texture Trim

The 540-Series Cedar Texture Trim is LP SmartTrim's heaviest and most substantial profile at 0.910 in. thickness — ideal for applications demanding extra bulk and rigidity: wide fascia, corner boards, and architectural accent bands. Same seven widths as the 440-Series. Treated Engineered Strand substrate. Pre-primed and compatible with all LP SmartSide siding systems.

Length	16 ft (4,877 mm)
Available Widths	1.50 in. · 2.50 in. · 3.50 in. · 5.50 in. · 7.21 in. · 9.21 in. · 11.21 in.
Nominal Thickness	0.910 in. (23 mm)
Substrate	Treated Engineered Strand
Texture	Deep cedar wood-grain
Fastener	Min 8d hot-dipped galvanized nail; 0.113 in. shank, 0.270 in. head; min 1 in. framing penetration
Butt Joint Gap	Min 3/16 in. — seal with ASTM C920 Class 25 sealant
Finish	Factory pre-primed; field paint required within 180 days

Specifications

38-Series Cedar Texture Lap Siding

Width	Thickness	Length
5.84 in. (148 mm)	5.84 in. (148 mm)	16 ft (4,877 mm)	0.315 in. (8 mm)
7.84 in. (199 mm)	7.84 in. (199 mm)	16 ft (4,877 mm)	0.315 in. (8 mm)
11.84 in. (301 mm)	11.84 in. (301 mm)	16 ft (4,877 mm)	0.315 in. (8 mm)

Treated Engineered Strand substrate. Max stud spacing 16 in. O.C.

76-Series Cedar Texture Lap Siding

Width	Thickness	Length
5.84 in. (148 mm)	5.84 in. (148 mm)	16 ft (4,877 mm)	0.375 in. (10 mm)
7.84 in. (199 mm)	7.84 in. (199 mm)	16 ft (4,877 mm)	0.375 in. (10 mm)
11.84 in. (301 mm)	11.84 in. (301 mm)	16 ft (4,877 mm)	0.375 in. (10 mm)

Treated Engineered Strand substrate. Max stud spacing 24 in. O.C.

440-Series Cedar Texture Trim

Width	Thickness	Length
1.50 in.	1.50 in. (38 mm)	16 ft (4,877 mm)	0.625 in. (16 mm)
2.50 in.	2.50 in. (64 mm)	16 ft (4,877 mm)	0.625 in. (16 mm)
3.50 in.	3.50 in. (89 mm)	16 ft (4,877 mm)	0.625 in. (16 mm)
5.50 in.	5.50 in. (140 mm)	16 ft (4,877 mm)	0.625 in. (16 mm)
7.21 in.	7.21 in. (183 mm)	16 ft (4,877 mm)	0.625 in. (16 mm)
9.21 in.	9.21 in. (234 mm)	16 ft (4,877 mm)	0.625 in. (16 mm)
11.21 in.	11.21 in. (285 mm)	16 ft (4,877 mm)	0.625 in. (16 mm)

Treated Engineered Strand substrate. No special tools required for cutting.

540-Series Cedar Texture Trim

Width	Thickness	Length
1.50 in.	1.50 in. (38 mm)	16 ft (4,877 mm)	0.910 in. (23 mm)
2.50 in.	2.50 in. (64 mm)	16 ft (4,877 mm)	0.910 in. (23 mm)
3.50 in.	3.50 in. (89 mm)	16 ft (4,877 mm)	0.910 in. (23 mm)
5.50 in.	5.50 in. (140 mm)	16 ft (4,877 mm)	0.910 in. (23 mm)
7.21 in.	7.21 in. (183 mm)	16 ft (4,877 mm)	0.910 in. (23 mm)
9.21 in.	9.21 in. (234 mm)	16 ft (4,877 mm)	0.910 in. (23 mm)
11.21 in.	11.21 in. (285 mm)	16 ft (4,877 mm)	0.910 in. (23 mm)

Treated Engineered Strand substrate. Heaviest trim profile — ideal for wide fascia and architectural accent applications.

Order quantities and lead times may vary. Contact us for availability.

Certifications & Testing Standards

LP® SmartSide® Engineered Wood Siding meets or exceeds the following Canadian and international performance standards.

Test / Property	Standard	Result / Value
ICC-ES ESR-1301 (performance standard ICC-ES AC321) — International Code Council Evaluation Service	-	Certified
CCNC 11826 — Canadian Construction Materials Centre	-	Certified
APA Recognition PR-N124 — APA – The Engineered Wood Association	-	Certified
HUD Recognition HUD-MR-1318 — U.S. Department of Housing and Urban Development	-	Certified
WUI Category 8140 — Wildland Urban Interface compliant	-	Certified
SFI-00003 Certified — Sustainable Forestry Initiative fiber sourcing and forest management	-	Certified
No added urea-formaldehyde — qualifies for LEED IEQ 4.4 credit	-	Certified
SmartGuard® zinc borate process — factory-applied termite and fungal decay resistance tested to the core	-	Certified
50-Year Limited Warranty — Substrate (prorated after Year 5; first 5 years	-	100% material and labour)
Hail Damage Limited Warranty — covers cracks and chips from hail up to 1.75 in. diameter	-	Certified
Warranty transferable to one subsequent owner (original purchaser + original owner + one next owner)	-	Certified

Installation Guide

Comply with all applicable local and national building codes. LP SmartSide installation specifications have achieved code recognition under ICC-ES ESR-1301 (performance standard ICC-ES AC321), APA PR-N124, HUD-MR-1318, and CCNC 11826.
CLEARANCES: Maintain minimum 6 in. (152 mm) between siding/trim and finished grade. Maintain minimum 1 in. (25 mm) clearance above any surface where water may collect (porches, patios, walks). Maintain minimum 1 in. (25 mm) clearance at roof lines. Siding and trim must NEVER contact masonry, concrete, brick, stone, stucco, or mortar.
SUBSTRATE: Install framing at 19% moisture content or less. Do NOT install over green or rain-soaked framing. Install a breathable water-resistive barrier (house wrap) behind all siding and trim per applicable building code. Properly integrate all flashing with the WRB to prevent moisture intrusion.
MASONRY & CONCRETE WALLS: When installing over masonry or concrete, fur out the wall with framing at 16 in. O.C. of adequate thickness, leaving the cavity open at top and bottom for convective ventilation.
WET CELLULOSE INSULATION: Wet blown cellulose insulation must not be in direct contact with the siding and must dry for a minimum of 24 hours before siding is applied.
STUD SPACING: 38-Series — maximum 16 in. (406 mm) O.C. 76-Series — maximum 24 in. (610 mm) O.C. With alternate fastening over APA-rated sheathing panels (minimum 7/16 Category, DOC PS 2), 38-Series 6 in. and 8 in. widths may also be installed at 24 in. O.C.
NAILING — LAP SIDING: Both series require minimum 1-1/2 in. penetration into structural framing. 76-Series: minimum 8d hot-dipped galvanized or stainless steel nail (0.113 in. shank, 0.297 in. head); maximum 12 in. O.C. 38-Series: minimum 6d hot-dipped galvanized nail (0.091 in. shank, 0.200 in. head); maximum 12 in. O.C. Place nails minimum 3/8 in. from board ends and minimum 3/4 in. from top edge.
Nail from the center outward, or from one end to the other — NEVER from both ends toward the middle. Fasteners below window sills must be spaced maximum 8 in. O.C. All exposed face nails must be caulked and sealed to prevent moisture intrusion. NO STAPLES.
NAILING — TRIM & FASCIA: Minimum 8d hot-dipped galvanized or stainless steel nail (0.113 in. shank, 0.270 in. head); minimum 1 in. penetration into structural framing or sheathing + framing. Place nails minimum 3/8 in. from ends and edges. Two nails at both ends of each board; maximum 24 in. O.C. along length, OR alternating edges at maximum 12 in. O.C. Number of nails per cross-section: less than 7 in.
wide = 2 nails; 7-12 in. = 3 nails; greater than 12 in. = 4 nails. For edge nailing, ALL nail holes must be pre-drilled — do not edge nail without pre-drilling.
INSULATED SHEATHING: Rigid foam up to 1 in. thick — nail directly through foam; increase nail length to ensure minimum 1-1/2 in. penetration into framing. Rigid foam greater than 1 in. thick — install minimum 1-1/2 in. x 3-1/2 in. vertical strapping over foam, fastened to framing at maximum 16 in. O.C. with minimum 1-1/2 in. nail penetration into framing.
ALTERNATE FASTENING — SIP ASSEMBLIES: Requires minimum 7/16 Category APA-rated wood structural panels (DOC PS 2). 38-Series: minimum #8 hot-dipped galvanized tapered-head wood screw (0.270 in. head) at maximum 12 in. O.C., or 6d ring-shank nail (0.091 in. shank, 0.200 in. head) at maximum 8 in. O.C. 76-Series: minimum #8 hot-dipped galvanized tapered-head wood screw (0.270 in. head) at maximum 16 in. O.C.
ALTERNATE FASTENING — ICF ASSEMBLIES: Minimum #8 hot-dipped galvanized tapered-head self-drilling screw (0.270 in. head). Minimum withdrawal value 50 lbs at maximum 12 in. O.C., or 31 lbs at maximum 6 in. O.C. Screw must penetrate minimum 3/8 in. beyond the thickness of the nailing flange.
ALTERNATE FASTENING — STEEL STUD FRAMING: Minimum #8 hot-dipped galvanized tapered-head self-drilling screw (0.270 in. head); minimum steel thickness 0.032 in. (20 gauge); minimum withdrawal value 50 lbs. Minimum 5 threads must extend beyond combined thickness of siding and steel. 38-Series max 16 in. O.C.; 76-Series max 24 in. O.C.
LAP & JOINTS: Overlap successive courses minimum 1 in. Butt joints must occur over studs; stagger joints across successive courses. Leave minimum 3/16 in. gap at all butt joints. Joint treatment — choose one: (1) seal with ASTM C920 Class 25 sealant; (2) install joint moulding (add moulding web thickness to the gap); or (3) if siding is prefinished by an approved LP prefinisher and backed with minimum 4 in. wide flashing with factory-finished ends, no sealant or moulding is required.
TRIM BUTT JOINTS: Leave minimum 3/16 in. gap; seal with ASTM C920 Class 25 sealant. Install 4 nails (2 on each side of joint). Do NOT miter corner joints of fascia, band boards, or corner trim.
FASCIA: Install a non-corrosive drip-edge at the bottom of roofing where it meets the fascia. 190-Series MUST have a solid wood sub-fascia. 440-Series or larger may be installed as fascia without sub-fascia only when BOTH conditions are met: (1) trim width is greater than 5 in., AND (2) rafter/truss spacing does not exceed 24 in. O.C. LP SmartSide trim and fascia are NOT designed for structural applications — do not use as structural members, trellis, railing, fencing, decking, or sills.
TRIM — EXPOSED OVERHANGS: When trim or fascia extends beyond the protection of the roof, cap the top of the exposed trim with metal coping integrated with the roofing system.
ADJOINING MATERIALS — VINYL SIDING: Install Z-flashing with minimum 4 in. upper leg between horizontal trim and J-channel. Do NOT caulk between trim and J-channel. STUCCO/BRICK/STONE: Maintain minimum 3/8 in. separation; seal with high-quality sealant (backer rod may be required per the sealant manufacturer's instructions). Install sloped Z-flashing over all horizontal trim. All flashing materials must have a service life of 50 years or greater; minimum 4 in. upper leg on all flashing.
FLASHING: Install kick-out flashing at all roof-wall intersections. Step flashing minimum 4 in. upper leg. Flash and shim all window and door openings so trim sits on a level wall plane; leave 3/16 in. gap between siding and window/door trim and seal.
FINISHING: Apply finish coat of 100% acrylic latex exterior paint within 180 days of installation (semi-gloss or satin finish recommended). Oil or alkyd paints are also acceptable. DO NOT use semi-transparent or transparent stains, shake/shingle paints, or vinyl-based resins (vinyl acetate, PVA, or vinyl acetate/acrylic copolymer). Prime and paint ALL exposed cut edges in the field.
STORAGE & HANDLING: Store flat on a well-supported, flat, well-drained surface off the ground. Cover with a waterproof covering and protect from direct weather exposure. Keep dry — do NOT install LP SmartSide wet.
WARRANTY CLAIMS: Contact LP Building Products at 1-800-450-6106 / LP Corporation, 414 Union St., Nashville, TN 37219.