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About Michael J. Owen
Expertise
Pretty much anything about roofing, particularly asphalt shingle and metal. Replacing damaged sheathing/plywood etc. Questions about venting attic spaces.

Experience
Twenty years of repair, new roof, roof overs and truss work. Still enjoy "getting on the roof".

Organizations
None

Publications
Just had my late mothers book published. A murder mystery set in England.

Education/Credentials
High school, College graduate in England. Now living in Panama, Central America after living in the U.S. for 25 years .

Awards and Honors
None

Past/Present Clients
Way too many to list in England, California, Bahamas, Florida and Georgia.

You are here: Experts > Home/Garden > Home Improvement/Repair > Roofing > metal roofing

Roofing - metal roofing

Expert: Michael J. Owen - 11/5/2009

Question
just built home now 2yrs old, no venting was installed due to interior ceilings not completed.now completed how do I vent to prevent condensation? they installed 1" insulation on top of perlins then metal roof.1" insul has a R30 value this wraps the whole house. do I use gable venting, ridge venting or both? no soffit venting was used but can be installed.
thanks

Answer
Hi David. I prefer and usually recommend ridge venting with soffit vents. The rule of thumb is one square foot of vent for every 150 sq/ft of attic space. Gable vents do work to a point but the hot air has to be pushed or pulled towards them. Ridge vents are so much better because they are at the highest point and distributed across the entire roof. Here is a web site that should help you:

http://www.rd.com/18231/article18231.html

Hope this answers you question.

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