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Old 02-18-2013, 04:31 PM  
Rmwoiak
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Default Attic Cross Member Question

Guys,

I am getting ready to put some flooring down in my attic to make more room for storage. I have three cross members (?) in my attic that I was unsure about. I have included a few pictures below. They are located in my town house which was a gable roof. The cross members are about 8in tall but only a 1/2 in thick. They don't seem very sturdy so I cant imagine they are structural. I wanted to see if anyone could identify them and see if I am able to safely remove them. Thanks guys.



2013-01-05_15-13-35_520.jpg   2013-02-18_17-12-46_198.jpg   2013-02-18_17-12-54_628.jpg  
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Old 02-18-2013, 04:48 PM  
nealtw
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They are ties to stop the roof from sagging. They are very much structural and should not be removed.



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Old 02-18-2013, 05:17 PM  
Rmwoiak
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Thanks, I just wanted to double check before I did anything dumb.

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Old 02-18-2013, 06:01 PM  
Wuzzat?
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How are they fastened at the ends? For structural purposes I'd think they'd use through bolts and thicker wood and a lot more of them.

Since the force spreading the roof is uniform, the horizontal roof line should look wavy when sighted at right angles to these boards if these are resisting a tensile force. The roof width would then be narrower at the few places where these strips are anchored.

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Old 02-18-2013, 06:31 PM  
JoeD
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Ignore Wuzzat.
They are called collar ties and they are needed.

http://www.nachi.org/collar-rafter-ties.htm

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Old 02-18-2013, 09:07 PM  
Wuzzat?
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Ignore JoeD.

The ones on my porch are 2 bys, three sandwiched with a center one for appearance. At least 12 nails at each end.

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Old 02-18-2013, 09:22 PM  
poppa
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I'm an old carpenter and we called those wind braces and put one on every other set of rafters. You really should put more in you don't have enough.

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Old 02-23-2013, 12:29 PM  
CallMeVilla
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When I built a large shed last year, I used 2x4 lumber for the ties to the rafters. Solid roof. Never going to sag and the wind will not lift it.

KEEP those ties in place.

PS If you are putting down plywood for storage, DO NOT lay the wood over any wires which are sitting on top of the ceiling joists. This could be hazardous!

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Old 02-24-2013, 11:00 AM  
AndyGump
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If you want to do away with them you would have to get a permit to make a relatively small change like this and install 20 gauge x 1-1/4" straps across the ridge from rafter to rafter.

Andy.

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Old 02-25-2013, 08:35 AM  
nealtw
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Andy: I would like to be polite but, wrong. Collar ties are placed in steep roofs at the half way from the birds mouth to the peak to supply support against sag. By adding this support, they make the span of the rafter 1/2 of the full length. Your straps would be added to prevent failure in high winds and is a different problem.



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