3 8 I Ch Plywood For Patio Roof

I am planning to have a new roof installed and currently have 3 8 plywood supported by trusses 24 apart.

3 8 i ch plywood for patio roof.

Cdx is the most common exterior plywood grade. For instance roof loads based on bending and shear stress may be increased 15. Plywood thickness in plywood wall sheathing without diagonal bracing 5 16 3 8 1 2 plywood roof sheathing 5 16 3 8 1 2 plywood subfloors 1 2 5 8 plywood underlayment 1 4 3 8 1 2 5 8 asphalt shingles to plywood staples to have crown width of 3 4. Most roofs will be sheathed in plywood at least 3 8 inch thick.

Beside cdx you can also find better grades such as abx acx and even bcx. All values are for 16 gauge galvanized wire staples having a minimum crown width of 3 8. The 3 8 cdx plywood was everything that i could expect from cdx plywood. There was a little bit of curl in the sheets but that is a rather typical problem with this thickness and grade of plywood.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. However you may need to consider bolstering the plywood thickness for a roof that has a higher load. A structural wood panel composed of a d grade or better face back and inner plies cross banded for strength. My neighbor had an additional 3 8 layer of plywood added.

Appearance stamps on plywood range from cabinet grade a to construction grade c and d. For the less standard 20 inch apart rafters plywood with inch or 5 8 th inch thickness can be used. Snowfall and ice accumulation can affect the load put on a roof. Ps 1 see table 2.

However 3 4 th inch plywood is also used for a roofing system that has a heavier load. It comes in 3 4 5 8 and 1 2 inch thicknesses. The tables also assume dry conditions normal duration of load and untreated plywood with interior glue. Table 3 applies to sanded grades such as a d and b d.

I am thinking of having an additional layer of plywood or osb added to the roof. All in all it more than exceeded my expectations. This was the worst of the damage i found damage where someone stepped on the joint but i ve seen 1 2 plywood break the same way where there were voids in the laminations at the edge of the sheet. Loads will vary with the pitch of the roof.

In this case plywood should be a minimum of 3 8 inch thick. Apa rated sheathing 24 0 span rating 3 8 inch 4x8. Exterior plywood carries an x stamp which identifies it as suitable for use outdoors. For other conditions the loads should be appropri ately adjusted using the factors given.

I haven t had any problems and the house is 40 years.