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ldsmann

04:01AM | 02/18/03
Member Since: 02/17/03
3 lifetime posts
Bvroofing
Have a house with a laminated beam at ridge.

Wanting to put ridge vent on roof. How would I determine adequate ventilation with ridge beam blocking vent? Can I drill holes in beam? If so, how would I determine what size hole and how many?

Piffin

03:41PM | 02/18/03
Member Since: 11/06/02
1281 lifetime posts
I would definitely not drill the beam.
It is a structural member and engineered to the size needed to support the roof. Removing material from it will weaken it and could lead to a sagging roof line.

If this is s new building, the decision to install ridge vent should have been made before framing so the rafters could be set high in relation to the beam and allow for this.

ldsmann

04:39AM | 02/19/03
Member Since: 02/17/03
3 lifetime posts
Granted it is a structural member. But the beam is in place, and the client would like ridge vents. Have consulted with structural engineer who has no problem with drilling two one-inch holes at same spacing as roof joists. My concern is whether this is adequate ventilation.

rpxlpx

03:15AM | 02/20/03
Member Since: 03/13/00
1675 lifetime posts
I'm no expert on this subject, but I'm a little confused. It seems as if the original plan was to have no ridge vent at all. Then, you plan to add a ridge vent, drill holes to allow some ventilation to it, and you want to know if that provides "adequate ventilation".

The original building plan should have had "adequate ventilation" before the ridge vent question came up, shouldn't it?

So, what's the intent ? - to get enough additional ventilation to make it "adequate" in total, or to appease a customer who wants something extra?

I think the answer to that question has a bearing on whether the drilled holes are "adequate" or not. Clearly, there's no way anyone can determine on this forum whether the total ventilation is adequate without a whole bunch more info.

[This message has been edited by rpxlpx (edited February 20, 2003).]

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