I’ve looked at forums and construction/framing books by the dozen (it seems) and I cannot find discussion on how to add a 2 story addition to the end of a single story house. My house is stuccoed with a “S” tile roof and I want to put a small garage with an office over it. How do I tie the new walls to the existing exterior wall? I know I must cut back the eaves and tie the new foundation to the old, it’s the common wall framing that’s got me snowed; would it be best to balloon frame the common wall?
Maybe this should be in a separate post, but, I also cannot find anything on how to actually frame an interior chimney/flue chase. Anybody able to steer me in the right direction?
Replies
Do you have a floor plan?
To show how you plan to situate this addition in relation to the existing house? Post it here if you can as it would possibly eliminate worthless information.
Yes you can balloon frame and yes you can conventionally platform frame it.
Same goes with the chimney chase (more likely stack frame it do to length of material on a two story).
Critical dimension is probably level of existing / addition floor and subsequent ht of addition foundation to acheive that with the joist size necessary for your addition floor framing.
Further, setting the height of the addition's windows to match your existing.
And of course, taking back the existing roof finish to incorporate the proper flashing.
pc. of cake.
Flue
What is the flue for? WBFP, gas log set? gas or oil appliances? Makes a difference. Knowing the building code is critical for you to DIY. What codes apply where you wish to build? The builders here will know what the kit manufacturers instructions say.
You could frame the new outside the old and enclose the stucco. The wall will be extra thick, but you really wouldn't have issues w/ the existing structure. Otherwise you would strip the stucco and build the 2nd floor starting on top of your existing top plate. This means also removing the end truss or rafters and dealing w/ your roof structure, etc. You'll have to take back a bit of roofing and flash the new wall to the old roof either way you do it.