[LarryGo]

I am building a roof over a deck that is on the main level of a house with a walk out basement. I'm using double 2 X 10's as the support beams for the roof rafters. I'm not using trusses so I will be doing a stick built roof using 2 x 6 rafters and a double 2 x 10 for the roof ridge support. The front support beam is resting on 6 x 6 posts on each corner which is a 20 feet span.
My question is whether this is too much of a span for the double 2 x 10's without any support in the middle
I forgot to add that I'm in Illinois.

 

[Nealtw]

I am building a roof over a deck that is on the main level of a house with a walk out basement. I'm using double 2 X 10's as the support beams for the roof rafters. I'm not using trusses so I will be doing a stick built roof using 2 x 6 rafters and a double 2 x 10 for the roof ridge support. The front support beam is resting on 6 x 6 posts on each corner which is a 20 feet span.
My question is whether this is too much of a span for the double 2 x 10's without any support in the middle
I forgot to add that I'm in Illinois.

Yeah, that is to far, I would think a 20ft beam holding up a ridge beam would be getting big. I think that might be why you see the gable timber frame truss is often used for that.

 

[LarryGo]

Thank you to the person that responded. I'm not sure of how to fix it at this point. I have another question. Does it matter if only one of the double 2 X 10's is fully sitting on the 6 x 6 post? The other one has only about 1" sitting fully on the post.

 

[Nealtw]

Thank you to the person that responded. I'm not sure of how to fix it at this point. I have another question. Does it matter if only one of the double 2 X 10's is fully sitting on the 6 x 6 post? The other one has only about 1" sitting fully on the post.

It's always best to have full support sounds like you will have 2 1/2" of bearing. That might have a chance of passing. Do you have a reason for that?

 

[LarryGo]

Thanks again. I have rectified the problem by cutting back on the 6 x 6 to where the double 2 x 10's are fully resting on the posts. I also glued and screwed 1/2" plywood between the double 2 x 10's for extra support of the 20' span. I hope this is all sufficient.

 

[Nealtw]

Thanks again. I have rectified the problem by cutting back on the 6 x 6 to where the double 2 x 10's are fully resting on the posts. I also glued and screwed 1/2" plywood between the double 2 x 10's for extra support of the 20' span. I hope this is all sufficient.

I don't like it. A double 2x10 will sag under it's own weight and now you have plywood that will stop it from sagging in 8 ft chunks.
If allowed to sag you would see it, but the early warning you get maybe just as it breaks.

 

[sandyman720]

I have a similar case so I called Weyerhauser (beam manufacturer which supplies my local lumber yard). Was on the phone for 10 minutes and the tech gave me 2 sizing options for beams and he emailed the specs to me. I submitted to my township for permit approval and they accepted them.

The number for Weyerhauser is 888 453 8358

 

[de-nagorg]

Thanks again. I have rectified the problem by cutting back on the 6 x 6 to where the double 2 x 10's are fully resting on the posts. I also glued and screwed 1/2" plywood between the double 2 x 10's for extra support of the 20' span. I hope this is all sufficient.

A better alternative would have been to use triple 2X as your beam, and cut the 6X6 off flush, no notch.

Then make sure the 3 2Xs are all "crown up".

That way they are less prone to sag and fail.

ED

 

[ron45]

If you can post some pictures.