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Guest User
9/21/2005
I am installing a raised rib metal roof over an existing roof that was prone to ice dams. I would like to use vertical and then horizontal battens. I am undecided if I should use 1X4 or 2X4 vertical battens. What would you suggest???? Thanks.
Allan Reid
Dura-Loc Roofing Systems, Inc.
9/22/2005
If you have ice daming, then you probably have significant heat loss. The first thing to do is ensure that you have adequate ventilation to exhaust the heat and ant moisture with it. If you have an attice, then make sure you provide soffit and ridge venting to a minimum of 1/150sf of ceiling are and at a 50-50 ratio. If you yhave a vaulted ceiling, then the code calls for a minimum of 1" of vertical free vented air. I would strongly recommend installing an ice an water membrane along the eaves and valleys prone to damming first, then use a 1 1/2" thick vertical batten. Centre them over the rafters so that they can be fastened into the structure not the sheeting. You can buy profiled vented closure strip to use at the eaves and ridge to provide the venting. Also try the versa vent universal strip from Atlas Bolt and fastener. Good luck.
Guest User
9/22/2005
Thanks for the reply. It is a cathedral ceiling withplastic under the drywall and 10" of insulation. There are 4 recessed lights that I'm sure lead to heat at the roof.
Todd Miller
Isaiah Industries, Inc.
9/25/2005
You're welcome.
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