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opening up old roof to gain access to attic space affer an addition.

opening up old roof to gain access to attic space affer an addition.


Old 04-11-14, 03:17 AM
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opening up old roof to gain access to attic space affer an addition.

The house had an addition put on some time ago before I bought it.
The original attic access was closed off and moved to the garage which is part of the new addition.

Up in that attic space there is about 4-5' of the old roof visible where the new roof attaches to it.

They had cut a section out of the old roof to gain access and or vent access to the original part of the house. The cut out is the width of one joist section by 3' long so apx 14 1/2" x 36" It seems big but because it is on an angle starting close to the floor of the attic space (or ceiling of the house)
Because the cutout is on the old roof and the roof is angled it is hard to get in that space the way it is.

Can it be widened without any structural problems by one more joist width?.
So it would be apx 29" x 36"

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Old 04-11-14, 05:01 AM
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It can be widened but it's not as simple as just cutting out the offending joist. That load has to be picked up elsewhere - it would need to be reframed to carry the load. Hard to say from here just what that would entail.
Old 04-11-14, 04:33 PM
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Marksr made a pretty good assessment. Just because it's "old roof" doesn't mean you can just hack it up. Hard to say without looking at it but if you'd like to cut out a portion of one rafter, you can certainly do that as high as you'd like to, but you would want to head the cut ends of that rafter off to the adjacent rafters so that they pick up the load, as Marksr mentioned.
Old 04-12-14, 05:01 AM
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If you just want it opened for ventilation you can cut out the sheeting between the studs in another bay. And, since an attic space like that only needs to be accessed very rarely I would not attempt structural changes to make access easier.
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