What Goes Under Exterior Siding?

Answer:

The wood that goes under residential siding — exterior sheathing — performs several functions. It adds insulation, waterproofing and structural support for the framing. It also provides a surface on which to nail the siding. The most common sheathing materials include oriented strand board and plywood.

Answer:

The wood that goes under residential siding — exterior sheathing — performs several functions. It adds insulation, waterproofing and structural support for the framing. It also provides a surface on which to nail the siding. The most common sheathing materials include oriented strand board and plywood.


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Frequently Asked Questions

Do you need sheathing under siding?

Most new walls need sheathing to strengthen them, to act as a nailing base for siding, and/or to boost insulation. Existing walls usually do not require sheathing unless you are stripping off the old siding and applying a different type that calls for sheathing.

How do I know what is under my siding?

If you can't get a peek from the underside, locate the end of a piece of vinyl where it overlaps another piece on a wall. The overlap should only be a couple of inches if the installers were efficient. Peel it back to reveal what's beneath — you may see insulation.

Do you have to put Tyvek under siding?

There is no logical reason not to have house wrap under vinyl siding, and many authorities strongly agree that it should be viewed as mandatory, even if your local building codes don't necessarily require it. ... Another benefit of quality vinyl siding is that it is highly water-resistant when correctly installed.

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