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What kind of plywood is suitible for exterior use but is not pressure treated?
Marine grade would be your best option. More on reddit.com
🌐 r/woodworking
4
1
June 6, 2025
Why pressure treated plywood is not used for sheathing?
If the sheathing gets wet, it will soak through to the interior side, causing mold and rot of the framing. More on reddit.com
🌐 r/Homebuilding
8
4
March 6, 2024
Does pressure-treated Grade A plywood exist? Is "premium" PT as excellent as grade A?
Maybe look into marine grade plywood. It's used for boats and stuff. More on reddit.com
🌐 r/wood
5
1
September 1, 2022
New to trailers. Would love some input on flooring! Looking to just use it to haul camping gear. Plywood? Fake wood? Any help is appreciated!
Whatever HF trailer you get… deck with 3/4” pressure treated plywood use LOTS of solid, galvanized bolts w/ wide washers to attach the board coat every square inch, top & bottom, you can with the asphalt used to seal foundations let dry in heat for a week Mine is stored outside and 20 years later still almost rust free, tough More on reddit.com
🌐 r/harborfreight
43
27
June 20, 2022
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Menards
menards.com › main › building-materials › panel-products › plywood-sheathing › ac2-reg-4-x-8-above-ground-green-pressure-treated-ccx-plywood-sheathing › 1235040 › p-1444422737171-c-13331.htm
AC2® 1/2 x 4 x 8 Above Ground Green Pressure Treated CCX Plywood Sheathing at Menards®
AC2® 1/2 x 4 x 8 Above Ground Green Pressure Treated CCX Plywood Sheathing
This plywood sheathing has been pressure treated for above ground (AG) applications. AC2® brand treated wood products use MicroPro® technology, which is a revolutionary way to pressure-treat wood. MicroPro® technology offers many benefits including significantly improved corrosion performance. MicroPro®/AC2® pressure-treated wood products are protected from termites and fungal decay and are backed by a Koppers Residential and Agricultural Limited Warranty Program (see warranty for details).
Price   $50.98
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Carlsbuildingsupply
carlsbuildingsupply.com › home › 14-treated lumber › 11-treated plywood
1/2" PLYWOOD PRESSURE-TREATED 4X8 CDX 15/32" ACTUAL SIZE .60 lbs PCF KDAT
11-Treated Plywood · Previous Next · Close · Previous Next · SKU# CDX12PT · 1/2 PLYWOOD PRESSURE-TREATED $ 41.33/EA · Pack Quantity · The quantity that makes up a standard package. You must order in units of this quantity. Items are sold in Gross and Pieces.
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LENCO Supplies
lenco.supplies › product › 1-2x4x8-treated-plywood
1/2"x4x8 TREATED PLYWOOD - LENCO Supplies
1/2x4x8 Treated Plywood: Durable 1/2 inch thick, 4 feet by 8 feet treated plywood. This versatile panel is weather-proof and insect-proof, making it perfect for outdoor projects and heavy-duty construction.
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Menards
menards.com › main › building-materials › panel-products › plywood-sheathing › ac2-reg-4-x-8-green-pressure-treated-ground-contact-ccx-plywood-sheathing › 1235100 › p-1444448725840-c-13331.htm
AC2® 1/2 x 4 x 8 Green Pressure Treated Ground Contact CCX Plywood Sheathing at Menards®
AC2® 1/2 x 4 x 8 Green Pressure Treated Ground Contact CCX Plywood Sheathing
This 1/2-by-4-by-8 AC2® CCX plywood has been pressure treated for ground contact (GC) applications. AC2® brand treated wood products use MicroPro® technology, which is a revolutionary way to pressure-treat wood for decks, fences, landscaping, and general construction uses. MicroPro® technology offers many benefits, including significantly improved corrosion performance. MicroPro®/AC2® pressure-treated wood products are protected from termites and fungal decay and are backed by a Koppers Residential and Agricultural Limited Warranty Program (see warranty for details).
Price   $53.98
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Rplumber
shop.rplumber.com › home › building materials › lumber & plywood › plywood
Buy 1/2" x 4' x 8' CD Yellow Pine MCA Pressure Treated Plywood
1/2" x 4' x 8' CD Yellow Pine MCA Pressure Treated Plywood
Structural plywood used for sheathing surfaces of a building prior to being covered with other materials such as flooring, siding, or roofing. C/D grade indicates that the face has knots and defects filled in while the reverse side may have some that aren’t filled in. Neither side has been sanded smooth or appearance grade.MCA stands for Micronized Copper Azole. MCA is a copper-based wood preservative used in pressure treated lumber allowing for residential installations above ground, ground contact, or freshwater contact. Lumber pressure treated with MCA can be used in interior applications a
Price   $36.99
Find elsewhere
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Oslumber
oslumber.com › home › plywood & sheathing › sheathing plywood
1/2" 4'X8' **TREATED** PLYWOOD
to search by sku (e.g. sku:1234, sku#1234) · to search by upc (e.g. upc:1234, upc#1234)
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Gatorgypsum
gatorgypsum.com › product › PTPLY12X8
1/2 in x 4 ft x 8 ft CDX Pressure Treated Plywood
Pressure-treated plywood is used when extra protection against weather, insect, and fungal damage is needed.
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Menards
menards.com › main › building-materials › panel-products › plywood-sheathing › 4-x-8-permanent-wood-foundation-pressure-treated-plywood › 1235230 › p-1444422463452-c-13331.htm
1/2 x 4 x 8 Permanent Wood Foundation Pressure Treated Plywood at Menards®
1/2 x 4 x 8 Permanent Wood Foundation Pressure Treated Plywood
This plywood sheathing has been preserved by pressure treatment with Chromated Copper Arsenate (CCA), an EPA-registered pesticide, to protect it from insect attack and decay. CCA pressure-treated wood products have stood the test of time, with some products that were installed as far back as the 1940s still in use today. CCA products are the materials of choice for post frame buildings and permanent wood foundations. Wood treated with CCA should only be used where such protection is important and approved. While CCA is not approved for residential use, it still has plenty of agricultural and f
Price   $56.98
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Reddit
reddit.com › r/woodworking › what kind of plywood is suitible for exterior use but is not pressure treated?
r/woodworking on Reddit: What kind of plywood is suitible for exterior use but is not pressure treated?
June 6, 2025 -

I'm putting together a shed from a kit. It has a metal frame for the base which is covered in plywood for the floor. The instructions for the base say you need to use at least 5/8" thick exterior plywood but it states specifically that use of pressure-treated wood is strictly forbidden and will void the warranty.

What kind of plywood is suitable for exterior use and contact with moisture but is not pressure treated?

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Hancock Lumber
shop.hancocklumber.com › product › 1-2-4-x8-cdx-syp-pressure-treated-plywood-ground-contact
1/2" 4'X8' CDX SYP PRESSURE TREATED PLYWOOD GROUND CONTACT | Treated Plywood | Hancock Lumber Shop
1/2" 4'X8' CDX SYP PRESSURE TREATED PLYWOOD GROUND CONTACT
1/2" 4'X8' CDX SYP PRESSURE TREATED PLYWOOD GROUND CONTACT · Product Code: 12CDXPPT · 3/4" 4'X8' CDX SYP PRESSURE TREATED PLYWOOD GROUND CONTACT · Product Code: 34CDXPPT ·
Price   $56.33
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The Home Depot
homedepot.com › lumber & composites › plywood
1/2 - Pressure Treated - Plywood - The Home Depot
/Plywood · 1/8: Nominal Product Thickness (in.) 3/4: Nominal Product Thickness (in.) Nominal Product WxL (ft.): 4 ft. x 8 ft. Paintable · Project Panels · Shop Savings · 2 Results · Sort & Filter · Sort by: Top Sellers · FiltersClear All · Nominal Product Thickness (in.): 1/2Plywood Features: Pressure Treated ·
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Sunnyvale Lumber
sunnyvalelumber.com › pressure-treated-plywood
PRESSURE TREATED PLYWOOD
Category PRESSURE TREATED PLYWOOD · $59.99 / PC · Other selling quantities available · DELIVERY · PICK-UP · Check stock in other branches · Your local branch is Sunnyvale Lumber, Sunnyvale · Call for price · Quick View · 1/2"X4X8 CD PT (STRUC 1) 5-PLY EXP.
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The Hull Truth
thehulltruth.com › the hull truth - boating and fishing forum › boating forums › boating how-to?s : the kerno memorial forum › best plywood for transom and stringers
Best Plywood for Transom and Stringers - The Hull Truth - Boating and Fishing Forum
September 29, 2017 - While I would use plywood for the transom - I would use composites for the stringers. ... I've used pressure treated marine tech before from George Kellet in New Orleans with good luck. ... You will pay a lot for the 10x5 sheets,like $200 per sheet.Menards carries good American 7 ply marine grade for $70 a 4 x 8 sheet.Glued and screwed will work fine.Seal any ply well on all sides and do not use treated ply. ... Yeah, a 5x10 sheet of 3/4 Okoume is $250 a 4x8 of Marine Fir is $84.....that allows for a lot of waste...I might go with the Fir and go 3 layers of 1/2 v 2 of 3/4 so that there are more seams spead around...
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McCoy's
mccoys.com › shop › p › 01140301 › cc-plywood-1532-in-x-4-ft-x-8-ft-southern-pine-pressure-treated-12-in
CC Plywood, 15/32 in x 4 ft x 8 ft - Southern
CC grade Plywood - this product is 15/32 in thick, 4 ft wide by 8 ft long and is made from Southern Pine. This product is also pressure treated.