Roof Plywood Or Osb

It becomes soft and weak when it delaminates.

Roof plywood or osb.

Unfortunately an osb is less resistant to water compared to plywood. While a sheet of plywood might be 5 to 7 plies thick a sheet of osb is made from as many as 50 strand layers packed and compressed into the same thickness. Find the area of a roof. Osb boasts a more consistent density.

Because of its construction some manufacturers actually make larger sheets of osb. New homes will usually see a few rainfalls before a roof is on and as noted above osb doesn t handle moisture well. It is generally believed that osb is cheaper than plywood. Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed.

Both osb and plywood absolutely hate water lipinskiy mentions going on to say that the most important part regardless of which decking option you choose is that all penetration points on a roof are sealed. Plywood is made out of laminated sheets of veneer. Talking about plywood or osb for roofing you cannot miss the information of the cost. This is one of the reasons why some people prefer using plywood for their roof or subfloor.

Speaking of osb it s a top choice of homeowners looking for something more affordable than plywood. Oriented strand board isn t plywood nor is it a type of particleboard fiberboard or wafer board and although it is a newcomer to a plywood dominated market its use for exterior sheathing is. To find the amount of plywood needed to cover a roof start by finding the area of the roof. When it gets wet the sheathing could swell and thicken up because of the moisture.

Despite its common use as such we don t recommend using osb for subfloors but that s really just for aesthetic reasons. Osb panels can be manufactured in lengths up to 16 feet or sometimes even higher while plywood is generally limited to 8 to 10 feet. Plywood is better than osb for subfloors. It s a top choice because of its characteristic wherein it expands evenly when exposed to water unlike osb wherein only the edges expand.

A few other downsides to plywood. Both cdx plywood and osb tend to come in standard sheets of four foot by eight foot 4 8. Thankfully there are osb materials today that are designed to be moisture resistant. Osb is made by combining glue resin and wood chips and pressing them into the shape of a plywood sheet then baking everything together.

Earlier types of osb were known as waferboard which is now considered a sub standard version of oriented stand board. For plywood it is like 5 to 10 more expensive. Because of this manufacturing process osb is at least half the cost of cdx plywood.