Rot Resistant Roofing Osb

If you re using a wood outside starting with a rot resistant wood is the most important step.

Rot resistant roofing osb.

Osb will swell warp and degrade unless it s kept safe from sunlight and perfectly dry. Even rot resistant woods can become vulnerable over time or with extreme conditions. When a wood is in direct contact with the ground it opens the wood to mold and fungus because it allows moisture to penetrate the wood. No paint will do this.

Osb is said to be more water resistant than plywood by some and not so by others. Because osb holds water prolonged exposure to roof leaks or excessive humidity and condensation in unvented attics can cause osb roof panels to degrade faster than plywood panels. Compounding this weakness is the fact that osb is often made from aspen and poplar which are not rot resistant woods. How to stop or prevent rot.

These have the highest resistance to rot over time. Since osb holds water prolonged exposure to roof leaks or excessive humidity and condensation in unvented attics can cause osb roof panels to degrade faster than plywood panels. The resistance of osb to rot depends on the material from which it is made. It s installed directly on the roof deck and provides a secondary layer of protection from the elements including rain snow and wind.

Roofing underlayment is what lies between the shingles and the roof sheathing or roof deck which is typically either plywood or osb. The zipsystem is a great all in one osb sheathing panel that has the building wrap already attached to it so all you have to do it tape the seams. With a weather resistant barrier like tyvek over the osb and then cover that with siding of some sort. Sheets made from aspen or poplar which are common have more rot susceptibility than those made from rot resistant species.

Compounding this weakness is the fact that osb is often made from aspen and poplar neither of which are rot resistant woods. If you want to use osb to sheathe the walls of your shed you need to build those walls like the walls of a house. 8 rot resistant woods naturally resistant woods that are commercially available include black locust robinia pseudoacacia teak tectona grandis ipe tabebuia spp california redwood sequoia sempervirens and bald cypress taxodium distichum. The exposed roof deck under unenclosed eaves and underside of porch ceilings shall be noncombustible listed ignition resistant materials or 5 8 type x gypsum sheathing behind exterior covering.

There s no such thing. Osb is great for walls and roofs and for subfloors i m particularly fond of an engineered wood panel similar to osb called advantech. Cbc 706a crc r337 6. After following these steps you will never risk moisture ruining your work down the road.