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Subfloors and Underlay (16)

When building a new home or remodelling a structure, a subfloor is the ideal base for a new floor. It provides a foundation that supports the top layer and protects it from damage. Subfloor plywood is extremely strong and can support most floor types including plywood and treated plywood. Additionally, underlayment plywood is a middle layer that keeps moisture from reaching the surface. For optimal and long-lasting results, consider all three components when installing a new floor.
Installing a top layer of hardwood, tiles or linoleum on your floor is only part of the job. It’s important to first lay down a layer of subfloor plywood. This prevents the floor from sagging and helps to increase its overall life.

Underlayment plywood is a different material than that used for other applications, such as deck panel plywood. It’s designed to hold up to the pressure of foot traffic. Without this additional layer of OSB plywood, the top floor would succumb to this pressure and have a shorter usable life.

When laying down carpet, it’s also a good idea to install an underlay. This layer goes between the carpet and the subfloor plywood. It pads the carpet for added comfort and resiliency and provides another barrier against moisture getting under the floor. Since the cold can seep into a home through the floor, a layer of special floor insulation can make the home less susceptible to energy loss. This prevents cold floors in the morning and can save on heating and cooling costs throughout the year. Underlayment plywood comes in different thicknesses. Use the thicker varieties for harder floors and the thinner pieces for carpeting.

One issue that homeowners face is uneven subfloors. This can result in uneven flooring, and can create gaps between the bottom layer and the surface. Because subfloor plywood installs directly over the joists, improperly levelled joists can cause the whole floor to be off. A quick and simple solution is to install levelling shims. These raise up the underlayment plywood without the need to plane down the joists or to make other fixes. Proper installation requires the application of adhesive to the joists, before screwing or nailing, so get wood glue and fasteners when ordering materials.
Barricade Thermal Shield Premium Subfloor Panels - 2-ft x 4-ft - 10-Pack icon-wishlist
BARRICADE
Barricade Thermal Shield Premium Subfloor Panels - 2-ft x 4-ft - 10-Pack
Format 10PK
Details
Article #01925005
4-ft L x 4-ft W Natural Poplar Subfloor Panel icon-wishlist
4-ft L x 4-ft W Natural Poplar Subfloor Panel
Format 5.2MMx4'x4'
Details
Article #5049001
Barricade 23.5 x 23.5-in Subfloor Air Plus Panel - Air Gap Technology icon-wishlist
BARRICADE
Barricade 23.5 x 23.5-in Subfloor Air Plus Panel - Air Gap Technology
Format 3/4x23x23"
Details
Article #6334032
3/8-in x 4-ft x 8-ft Subfloor Panel icon-wishlist
3/8-in x 4-ft x 8-ft Subfloor Panel
Format 3/8"x4x8
Details
Article #4350001
5/16-in x 4-ft x 8-ft Subfloor Panel icon-wishlist
5/16-in x 4-ft x 8-ft Subfloor Panel
Format 5/16x48x96"
Details
Article #4350002
Richelieu 7/32-in Thick Hardwood Birch Plywood - 4-ft W x 8-ft L icon-wishlist
Richelieu 7/32-in Thick Hardwood Birch Plywood - 4-ft W x 8-ft L
Format 4'x8'x5.5MM
Details
Article #50685043
Subfloor Panel - 8,5mm x 4' x 8' icon-wishlist
Subfloor Panel - 8,5mm x 4' x 8'
Format 8.5MMx4'x8'
Details
Article #6334022
Richelieu Underlayment Plywood - 4-ft W x 4-ft L x 1/4 in-D - Grid Spaces icon-wishlist
Richelieu Underlayment Plywood - 4-ft W x 4-ft L x 1/4 in-D - Grid Spaces
Format 4x4
Details
Article #50685042
Barricade 23.5-in x 23.5-in x 1-in R2.7 Foam Insulation Subfloor Tile icon-wishlist
BARRICADE
Barricade 23.5-in x 23.5-in x 1-in R2.7 Foam Insulation Subfloor Tile
Format 23.5x23.5"
Details
Article #01925006
INSULFLOORBOARD-R3 Insulated Subfloor Panels - 4/Box icon-wishlist
INSULFLOOR
INSULFLOORBOARD-R3 Insulated Subfloor Panels - 4/Box
Format 16"x48"x4EA-20.5SF
Details
Article #8798001
Barricade 23.25-In x 23.25-In Wood Insulated Subfloor Panel 3.2-R Value Natural Finish icon-wishlist
BARRICADE
Barricade 23.25-In x 23.25-In Wood Insulated Subfloor Panel 3.2-R Value Natural Finish
Format 23 1/4x23 1/4"
Details
Article #01925004
Subfloor Leveling Shims - Pack of 24 icon-wishlist
BARRICADE
Subfloor Leveling Shims - Pack of 24
Format PK24
Details
Article #01925003
Barricade 23.25-in x 23.25-in x 1-in Tongue and Groove OSB Insulated Subfloor Panel icon-wishlist
BARRICADE
Barricade 23.25-in x 23.25-in x 1-in Tongue and Groove OSB Insulated Subfloor Panel
Format 23 1/4x23 1/4"
Details
Article #01925002
DELTA 3-1/2-ft x 30-ft x 105 sq ft FL Roll icon-wishlist
DELTA
DELTA 3-1/2-ft x 30-ft x 105 sq ft FL Roll
 
Details
Article #03825023
Amdry 3/4-in x 2-ft x 2-ft Heavy Duty Subfloor Panel icon-wishlist
AMDRY
Amdry 3/4-in x 2-ft x 2-ft Heavy Duty Subfloor Panel
Format 3/4"x2x2'
Details
Article #30735744
2-ft x 2-ft x 3/8-in Subfloor Panel (8-Pack) icon-wishlist
DURADRIVE
2-ft x 2-ft x 3/8-in Subfloor Panel (8-Pack)
Format 8PK-2x2'x3/8"
Details
Article #30735690