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Old 11-14-2012, 01:06 PM   #1
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shop addition in NH


I'm planning a 8x16 addition onto the side of my shop. I will be using ALL reclaimed lumber and keeping this as SIMPLE as possible. I will be using reclaimed granite cobblestones for the floor. I'm stuck trying to decide just how crazy I'm gonna get on the foundation.

what do you guys think? Would I be ok just using cinder blocks along the entire bottom of the sill?

the other option is digging 3 holes and filling with sonotubes and going post beam style...the problem is, I would like to basicly just cut the 16' of wall out of my garage and use it for the new wall....


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Old 11-14-2012, 03:54 PM   #2
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what is the foundation under the existing garage? slab on grade? Piles? sitting on dirt?
Is any of it going to be heated?
What is your frost depth?
Your cobblestones you want to remain flat? or is it ok if they heave?

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Old 11-14-2012, 04:28 PM   #3
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to remove the wall that is currently supporting your roof you would either have to change the direction of the roof and install a beam of sufficient size to support the roof loads.
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Old 11-14-2012, 08:34 PM   #4
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Quote:
Originally Posted by mae-ling View Post
what is the foundation under the existing garage? slab on grade? Piles? sitting on dirt?
Is any of it going to be heated?
What is your frost depth?
Your cobblestones you want to remain flat? or is it ok if they heave?
current is a 9'' thick slab poured between 48'' footers.

Yes it will be heated, but only when I'm working in it.

My frost depth is 44''.

I'm not dead set on the cobblestones, but I have a BUNCH of them, and I can't think of any easier way to construct a decent floor. I'm not against pouring cement ( I have a mixer). But thats ALOT of cement to mix...

I'm not too concerned about them heaving a small amount. I have a 10x10 shed thats just on 4 cinder blocks. Been like that for 2 years and NO HEAVING whatsoever...
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Old 11-14-2012, 08:35 PM   #5
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to remove the wall that is currently supporting your roof you would either have to change the direction of the roof and install a beam of sufficient size to support the roof loads.
I'm not worried about that. A couple 2x12s with some 3/4''plywood sandwiched will do the trick.
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Old 11-14-2012, 08:39 PM   #6
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ok, I was just concerned about the flatness of the new roof and the fact the snow will pile up on it, and turn to ice over time as it thaws and freezes ...... would expect greater load potential than just your ground snow load requirement
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Old 11-15-2012, 08:15 AM   #7
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if you can do it take the new proposed roof up to and sit on the ridge of the existing roof. frame an intermediate wall on top of the existing exterior wall to allow a break joint in the rafters. you might could build a temp wall inside existing structure to hold it up while you add in the new header,take down wall etc... you will have better slope on new roof if done this way
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Old 11-15-2012, 08:26 AM   #8
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I'm 100% with hard drive on this one.
I used to live in NH and saw many of those style roofs your thinking of building fail or at least leak from the snow load.
Depending on the wind direction it can cause a vortex that will leave a ton of snow laying between the new and old roofs that your going to end up having to climb up and shovel off before it collapes.
On my dads car port that was added onto his garage the snow would build up all the way to the peak of the main garage. One time it was higher then my head from the drifting snow.
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Old 11-15-2012, 08:56 AM   #9
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so true Joe,

on a side note as this does not apply to the OP, but when constructing a one story roof next to a building with a two story roof to account for the potential impact load of snow/ice sliding off the higher roof onto the lower one.

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