Large loft question

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Old 03-03-16, 08:08 PM
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Large loft question

I am planning on building a loft space in a room in my house. I had originally planned to use 4x4s as cleats on 3 sides. But the loft is going to be 5' deep and about 15' wide. I don't have access to a 4x4 that long. Should I piece together the 15' span with 4x4s, or use 2 pieces of 2x4x16s sandwiched?

Thank you for your help.
 
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Old 03-03-16, 08:15 PM
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If you are referring to using a ledger on 3 sides... there is no reason for it to be a 4x4. A single ledger would work fine. But 2x4 is almost certainly too small, it should be a minimum of 2x6 to span 5' deep... and without knowing more about your plan I hesitate to even recommend that, without knowing how you intend to support that front 15' span. Will you be putting any posts in under the front rim?
 
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Old 03-03-16, 09:05 PM
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Yes, I'm planning on using 4, 4x4 or 6x6 posts across the front.
 
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Old 03-03-16, 09:59 PM
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If you use 2x6, you could probably get away with 2 posts, to create 3 spans of 5' each. The rim in front should probably be doubled. Joists in joist hangers since the span is over 4'. What is its intended use? Storage?
 
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Old 03-04-16, 08:21 AM
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It will be in a playroom for my kids, to increase their play area. It will be about 5' off the ground. I need it to be strong enough for multiple people to be up there, adults or kids. It's an ambitious project for me, so I'm trying to do lots of research and planning before I start. Any advice is appreciated. Is it important to have a solid piece across the back (the ledger across the back wall), or could I use 2 7.5' pieces?
 
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Old 03-04-16, 02:14 PM
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Its not imperative that the ledger be one piece. If two pieces, it should break between studs so that the splice will only be about 8" from where its attached. Ledgerloks would be a good idea. The front rim should not have splices so imo you are getting two 16' boards, why not get 3? And for the subfloor, don't mess around, get 3/4" tongue and groove for a solid floor. 2x6 with no more than a 5' span will make a nice solid loft. Just be sure to locate wall studs, use 4" ledgerloks dead center in the wall studs, and joist hangers with the appropriate nails or screws called for. Your joists could go as much as 24" on center when you use 3/4" subfloor.
 
 

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