Questions and Answers

Vinyl siding question

Joanne Asked:

Our garage is sided with T-111 plywood siding.  Can vinyl siding be put directly over the T-111 or what other steps would need to be taken?
I appreciate any advice.

Hello Joanne,

T-111 siding is a fine substrate to install vinyl siding over provided it is structurally sound and the manufacturers recommendations are followed.  If the T-111 is 5/8 inch thick the vinyl siding can be nailed anywhere on the panels.  If it is only 3/8 inch thick the vinyl siding nails should be driven into the studs with at least 3/4 inch of penetration.

Vinyl siding should not be applied directly over wood siding.  The recommended method is to wrap the structure with a moisture resistant house wrap such as tyvek or similar product.  Roofing felt may be used but it is not my preference.  Moisture barriers are now  required by code in many areas.

An excellent source for information on installing vinyl siding may be found at the following link: Napco vinyl siding installation guide.  Click on the words “installation manual” located near the bottom of the page to down load the guide.  (Page sixteen, paragraph one, of the downloaded manual addresses moisture barrier recommendations.

Best regards and good luck with your siding project.

Tony Wood

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