Soft Plywood On Roof

Differences in the wood the primary difference between hard and soft plywood is the wood used to make it.

Soft plywood on roof.

Roof decking is the material that lies on top of the main roofing structure and the underlayment and roof covering is applied on top. Now any new roof in massachusetts must have a minimum of 7 16 sheathing with h clips. The roof sheathing is soft from years of excess condensation in the attic. Take off the roof covering which usually consists of plywood screwed into the rafters and walls.

When used for roofing plywood panels are covered and protected by a variety of building materials that keep the elements at bay including roof felt underlayment flashing and shingles. This can be a result of the plywood sheeting becoming wet from rain above or from moisture not being able to escape from below and leading to mold mildew growth on the wood. If you can tell there s a soft spot on your roof this most likely means that the substrate below the roofing material is damaged and deteriorating. These soft spots usually form when the layer underneath gets soaked due to gaps in the shingles.

Set the depth of the circular blade to cut through the thickness of the roof sheathing. That dip in the roof with a soft spot indicates that you should have your roof repaired asap. Why is plywood used in roofing. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads.

Most roofs will be sheathed in plywood at least 3 8 inch thick. Loads will vary with the pitch of the roof. In roofing plywood can be used as roof decking. Do not cut into the roof rafters.

In roofing plywood is often selected due to its strength. Strip out all materials such as fiberglass or wool insulation between the cavities to expose the roof s support beams. For soft plywood the trees of choice are spruce douglas fir and maple which are known for their flexibility and malleability. The reason for these soft spots is that the layer underneath is probably very soaked due to gaps in the shingles cause over time and weather changes and the water is seeping through the sheeting.

The most common uses for plywood include support for floors walls roofs and garages in residential construction. Most roofs have plywood sheeting underneath the roofing tiles or shingles. That dip in the roof with a soft spot is indicative of the fact that you should have your roof repaired asap. One of the most common questions we receive here concerns roof soft spots.