Adding shed roof to cantilevered truss?
I’m looking at a project involving a new patio roof attached to existing trusses. Part of the attachment is at the exterior wall line, but ~20′ of it is at a recessed portion of the house where the trusses are cantilevered from a wall that is 4’6″ back from the other wall line. The total patio will cover 10′ (from the outer wall line) x 42′.
Can I overlay/attach the shed roof all across at the main wall line, or must I take the shed attachment to the recessed wall line? If so, I assume it is OK to load the regular trusses 4’6″ in from bearing, this is something that I have done many times.
This will eventually be engineered, as I will need to have the piers/foundation engineered anyway, but I was hoping to get to a rough estimate to see if we have a project or not.
Anyone done this recently?
I’m not as funny as I think I am
Replies
I'm not really following the recessed part but either way without loading all the weight of the shed roof on the cantilevered trusses, can't you put a kneewall on the outside wall underneath the shed rafters so that the main weight is on the kneewall?
Dang, I wish I could do sketchup.
The recess is a rectangle cut out of the corner of the house, but the roofline continues as if the corner was still in the house, therefore the trusses bear 4'6" back from the eave line.
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I'm not as funny as I think I am
If you're worried about the load on the cantilevered portion (I think it might be a problem, myself--the truss plant that built them could probably quickly tell you whether the trusses could hold the additional point load on the tails/ or could be modified to do so)...but if it's a problem, you could merely build up the sub-fascia at the alcove area to be a load carrying beam, joist hang the new porch rafters to it and post it on both sides of the (entry?)..Might have to cut the concrete a bit and pour post footings, but no big whoop. The fascia/beam would take most of the load off the truss tails.I don't see any need/benefit in bringing the roof transition all the way up to the inside alcove wall (unless you need more headroom for a low slope)
If in a snow area, pay attention to stability with differential loadings.