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Old 06-08-2012, 07:21 PM   #1
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Attic Catwalk Parallel to Joists?


Hi All,

I'm planning to build a catwalk (really more of a "crawl" walk, since I don't have a lot of clearance) in my attic to more easily access wiring and other systems.

My current joists are 2x6 16" on center, and that only gives me 6" of blown-in, so I'm going to build up the joists under the catwalk with another set of 2x6s and ply gussets as described here (http://www.thisoldhouse.com/toh/askt...845054,00.html).

My problem is that more than half of the catwalk (30') will be parallel to the floor joists. Will this be stable enough, or do I need to brace it in some way?

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Old 06-09-2012, 02:11 AM   #2
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Attic Catwalk Parallel to Joists?


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Originally Posted by keodark View Post
Hi All,

I'm planning to build a catwalk (really more of a "crawl" walk, since I don't have a lot of clearance) in my attic to more easily access wiring and other systems.

My current joists are 2x6 16" on center, and that only gives me 6" of blown-in, so I'm going to build up the joists under the catwalk with another set of 2x6s and ply gussets as described here (http://www.thisoldhouse.com/toh/askt...845054,00.html).

My problem is that more than half of the catwalk (30') will be parallel to the floor joists. Will this be stable enough, or do I need to brace it in some way?
So much for this old house.

Look this is just a simple thing. Cut ply large enough to catch two bottom cords that will be perpendicular to ply

When cords are parallel cut 2bys lay perpendicular to catch 3 cords now you still can use smaller sheet of ply to lay over that.

I have no clue how much clear span is on bottom cords in that paralleled run. or weather a wall underneath acts a a inside bearing wall if bottom cord touches wall framing below.

That can make a difference when going parallel. So to solve that cut 2bys to catch tree cords and yes a 1 1/2 bump up will be there on that transition in walk. But your using 3 joist to hold weight is a better bet here.

As far as drywall screws are fine approx 1' oc,

This old house of glue and deck screws is nuts. Another liability sue thing going on here..

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Old 06-10-2012, 01:07 AM   #3
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Attic Catwalk Parallel to Joists?


Thanks, 21boat, although I'm not quite sure I understand your suggestion. Part of my goal (and the reason for the gussets & 2x6s in the This Old House link) is to raise my existing attic floor by 6 inches to accommodate more blown-in insulation, and build the catwalk above the new insulation level. I'm not sure if your suggestion accounts for that? Please correct me if I'm wrong.

Thanks!
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Old 06-10-2012, 03:05 PM   #4
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Attic Catwalk Parallel to Joists?


Keodark..
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Old 06-10-2012, 03:11 PM   #5
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Attic Catwalk Parallel to Joists?


Sorry, forgot to rotate it. You'll have to turn your laptop/monitor on its side!
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Old 06-10-2012, 03:21 PM   #6
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Attic Catwalk Parallel to Joists?


Tony-
Awesome! That's exactly what I was looking for. Thanks!!
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Old 06-10-2012, 03:51 PM   #7
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Attic Catwalk Parallel to Joists?


dont over do it, design should be based on expected load. I wuold imagine that 99.99 percent of the time the catwalk will NOT be used.

you probably just need some plywood (or 2x4) strapping to hold the 2x6's parallel every so often.

goal should be cheap as possible with scrap materials and keep the weight low.

the osb/plywood decking will add a large amount of rigidity.
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Old 06-10-2012, 04:29 PM   #8
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Attic Catwalk Parallel to Joists?


2x6s over a span of 16" seem awfully strong for a catwalk that only holds up body weight which is distributed over a few feet on your hands and knees.

Probably 1x2s stood on edge spaced every foot or so are strong enough but you can check the "beam loading" section on the Engineering Toolbox site.

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