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Old 03-04-2010, 07:59 PM   #1
 
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walking in attic


i own a 735 sqft home. the attic is approx 21 ft wide by 35 long. the trusses are made of 2x4's. The house was built in 2007.

I am 230 lbs. Will I crack the ceiling drywall joints if i walk in the attic? I know you are supposed to be able to walk on the rafters, but is there a weight limit? I don't want to find out the hard way....
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Old 03-04-2010, 08:41 PM   #2
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Quote:
Originally Posted by big guy1 View Post
i own a 735 sqft home. the attic is approx 21 ft wide by 35 long. the trusses are made of 2x4's. The house was built in 2007.

I am 230 lbs. Will I crack the ceiling drywall joints if i walk in the attic? I know you are supposed to be able to walk on the rafters, but is there a weight limit? I don't want to find out the hard way....
Well, you can think of the drywall (not just the joints) as very weak concrete. We all know concrete has incredible compression strength, but it's tensile strength is horrendous.

I wouldn't risk it at all. I'm 180 and when I've been in attics and accidentally put one foot down on the ceiling, it flexes and I know right away that I've missed a joist.
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Old 03-04-2010, 08:49 PM   #3
 
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thanks for that but what I meant was if i walk on the rafter itself, would the rafter bend and cause the drywall to crack? are the rafters designed to hold 230 lbs?
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Old 03-04-2010, 08:53 PM   #4
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Oh, that's how you're supposed to walk through attics without a subfloor. Of course, you're fine. The only load those 2x4s (on their side) will have to bear is you. Should be no issue, and what little deflection there may be won't hurt the drywall (normally).
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Old 03-04-2010, 09:01 PM   #5
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I usually put planks down to walk on, helps spread the load out a bit
MIL's house the 2nd floor rafters are maybe true 2x4's
I use planks & walk around



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Old 03-04-2010, 09:21 PM   #6
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If real trusses, made with #2 grade lumber, doug/fir, with a fink web design breaking the spans to 7', without real plaster ceilings or heavy cellulose insulation.......... They should support 227 total pounds. Subtract drywall ceiling (5/8"=2.75#)at 24" on center (5.5# x 7' = 39#), and fiberglass insulation (0.04# x 12" = 0.48#) plus 39# = 40# minus 227# = 187# for 7' between truss plate connectors.

What are the:
1.spans between connection plates at the webs,

2. insulation type, thickness,

3.ceiling material,

4.and on center spacing?

Be safe, Gary
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Last edited by Gary in WA; 03-04-2010 at 09:24 PM.
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