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KinAlberta
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# Posted: 20 May 2018 12:49 - Edited by: KinAlberta
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I have a 16’x22’ boathouse on blocks that I’d like to put metal siding on. Being on blocks though it moves/bends a bit.
So I plan to add more 2â€x _ material to the existing beams to strengthen them. (Lengthwise 22’ 2x6 beams under 2x6 joists then 16’ 2x10 beams across under the 2x6 beams.) All sitting on a number of doubled up 24â€x30†sidewalk blocks on the beach sand/gravel/rock. Concrete blocks on top of the sidewalk blocks.
I was also thinking that I could quite easily add a new layer of sheathing over top of the existing sheathing but overlap the new over the old and glue and nail it on. I would expect that this would significantly strengthen the two long walls and prevent sag / bending. Plus make it easier to install the metal siding.
Otherwise just run firing strips - but then I’d have hollow space subject to more or easier denting.
Thoughts?
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Borrego
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# Posted: 21 May 2018 10:50
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I think you're on the right track in your thinking....stiffen it up....you gonna use CDX or OSB? Then Tyvek or similar, and then metal...?
While you're on this project, are the footings sufficiently strong? Might you need to drill/epoxy in some metal?
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KinAlberta
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# Posted: 22 May 2018 23:03 - Edited by: KinAlberta
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I initially was thinking 1/2 or 3/4†pressure treated plywood on the bottom half and then 3/4 is on the top half to save money. Then realized that the PT might destroy the screws.
It’s just sitting on cinderblocks.
Should mention that it’s just a cheap garage package built in the 1970s and never sided, has a slightly sloping dirt floor.
In looking at it yesterday I can see a couple points that need to be jacked up and leveled a bit. I’ll maybe use a water level or laser level to get it right all around before adding more siding.
My thinking is that by stiffening up the walls the weight will be spread more evenly over the blocks.
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KinAlberta
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# Posted: 23 May 2018 23:08 - Edited by: KinAlberta
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Found several pages of interesting discussion here:
Bending Strength of Edge Loaded Plywood | Boat Design Net
https://www.boatdesign.net/threads/bending-strength-of-edge-loaded-plywood.54809/
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Bushwhacked
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# Posted: 24 May 2018 00:38
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What is your end goal?
To use it as a garage?
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KinAlberta
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# Posted: 24 May 2018 01:41 - Edited by: KinAlberta
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Sorry, I mixed up my two projects. ( I’ve changed my plan and started working on the garage first since the mandoor was falling off.)
Nonetheless whether it’s the boathouse or the garage - same plan (to add metal siding to each of these plywood sheathed but never sided buildings).
Both are 1970s 2x4 construction, unfinished interiors, and both are on concrete blocks but the boathouse has a plywood floor and the garage sits on dirt. Both have also been subject to a bit of movement so my plan is to strengthen the walls to minimize any future sagging risk, before adding the siding.
Basically both are showing their age, need doors moved/replaced, and then some metal siding to avoid painting them ever again. I figure they both should then be good for at least another 40 years.
The end goal is basically beautification, life extension, and minimized maintenance. (Since being built over 40 years ago, we’ve repainted them just once however the sheathing in a couple small places on the garage is weathered and failing.)
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Borrego
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# Posted: 24 May 2018 10:32
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Just FYI...they make screws that are ok for use with Pressure Treated
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KinAlberta
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# Posted: 26 May 2018 20:41 - Edited by: KinAlberta
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Yeah I know of stainless steel but I’m not aware of any acq
I’m also not sure of how much of a premium I’d have to pay for the stainless steel assuming I could get the right colour.
(With the metal siding being painted it’s probably somewhat resistant to the corrosive effects of the PT but I guess a separating membrane would be the best way to go.)
I’m thinking though that I’ll just use regular exterior ply but not PT.
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