Vapor barrier helpful with home insulation

Q. Will blow-in attic or wall insulation, or Styrofoam-brand insulation, without a vapor barrier rot house timbers? If either is injurious, what can be done? Can vapor barriers be added to the inside walls? W. C. Hutcheson Boydton, Va.

A. Fiber glass will not rot anything. However, moisture can be a problem. The Mineral Insulation Manufacturers Association, Summit, N.J., recommends the use of a vapor barrier. The trade group further suggests that homeowners get in touch with their local building department for recommedations on the use of a vapor barrier.

Temperature and humidity vary from one locale to another.

Climatic extremes call for different types of insulation and vapor barriers. A blanket answer is thus unwarranted.

Certain paints can be used on interior surfaces to provide a vapor barrier if one cannot be installed with the insulation. Interior paint systems that effectively control the moisture level of wood within wall cavities have been identified in research conducted at the Forest Products Laboratory, PO Box 5230, Madison, WI 53705.

With one minor exception, two coats of interior semigloss latex, exterior acrylic latex, or exterior soya-alkyd resin generally kept the moisture content of walls below 20 percent, even though 35 percent relative humidity was maintained indoors.

The research report by Gerald E. Sherwood is entitled: "Paint as a Vapor Barrier for Walls of Older Homes." Write for it.

About these ads
Sponsored Content by LockerDome

We want to hear, did we miss an angle we should have covered? Should we come back to this topic? Or just give us a rating for this story. We want to hear from you.

Loading...

Loading...

Loading...

Save for later

Save
Cancel

Saved ( of items)

This item has been saved to read later from any device.
Access saved items through your user name at the top of the page.

View Saved Items

OK

Failed to save

You reached the limit of 20 saved items.
Please visit following link to manage you saved items.

View Saved Items

OK

Failed to save

You have already saved this item.

View Saved Items

OK