Ceiling (attic floor strength)


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Old 05-22-23, 06:36 AM
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Ceiling (attic floor strength)

I apologize as this may be a silly question. New home to friend has a second floor addition (might be original but hard to tell) with walk out attic. There is a little clearance between the ceiling and the roof. Issue is the bathroom exhaust fan vents to attic. To access, would have to get in attic and crawl about 30 feet on the joists. Any chance that the second floor ceiling could not support a 225 pound man.
 
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Old 05-22-23, 08:30 AM
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You can go in the attic as long as you support your weight on the joists. I find it easier to take a series of 12" x 3/4" boards or strips of plywood into the attic to lay across the joists. Then I can belly slide. Trying to crawl on joists is pretty difficult and painful.
 
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Old 05-22-23, 09:15 AM
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Thank you, thought that was the case but just wanted to make sure there would usually not be an instance where it could not support all that weight, me specifically.
 
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Old 05-22-23, 12:46 PM
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walk out attic ?

Standard ceiling joists.... 2x6's - 2x8's..... on 16" centers are fine to be on.
It's attic truss systems you need to be careful of with 24" spacing and undersized "joists".
 
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Old 05-22-23, 01:35 PM
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The attic is walkout with 4 foot doors and plywood (floor) from each bedroom with a bathroom, stairs in the middle. I have not ventured to check the system on top of the bedroom, bathrooms on the second floor but will keep that in mind when I get to check on the weekend.
 

Last edited by PJmax; 05-22-23 at 03:34 PM. Reason: resized/enhanced diagram
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Old 05-22-23, 02:01 PM
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With doors to the attic and flooring.... you're safe.
 
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Old 05-22-23, 02:46 PM
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Just to clarify, I will be getting on the second floor bedroom and bathroom but will access it from those attic doors. Will check the spacing on the ceiling before moving forward.
 
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Old 06-03-23, 12:25 PM
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Here this weekend and realize there is not access from the attic to the ceiling of the bathrooms. Would have to crawl up the ceiling of the stairs. It is 2 by 6's 14 inches apart. Would/could that support me. If so, could I attach 2 by 4s to use as stairs to get up there.


Ceiling of stairs

Side view to top of bedroom

Limited access to bedroom ceiling
 
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Old 06-03-23, 04:49 PM
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Why can't you access attic by placing a ladder on second floor (called attic in diagram of post 5) against either bedroom wall with the 4 foot door?
 
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Old 06-05-23, 06:08 AM
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That was the intention but when I got back this weekend that is the picture Limited access to bedroom ceiling. Even if I was thin enough, the roof nails would get me. It is that way across both bedrooms. The only access is above the stairs.
 
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Old 06-05-23, 11:43 AM
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This is a cape cod style home. The is no second floor. The 2 bedrooms and bathroom are built in the attic. If the bedrooms/bathroom ceiling joists are not attached to roof rafters on both ends, there is a chance the ceiling rafter(s) could rotate from too much weight so be careful if crawling there. Can the fan work be done gaining access from the bathroom and the accessible space near the bathroom ceiling?
 
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Old 06-05-23, 12:27 PM
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Thank you for the explanation. That would most likely be best but can a bathroom vent be installed from within the bathroom. I imagine we could cut the old one out since it is rusted and a cheaper model but thought you would have to get above to replace.
 
 

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