What is the maximum allowable distance between load bearing walls and the outside walls?
The maximum distance between a load bearing wall and the outside wall (which is also a load bearing wall) will be determined by the load is needs to carry and what the maximum depth and centers of supporting joists you wand to use.
For example if you use 12" deep joists @ 12" on center then the distance between walls can be greater that using 7" joists @ 16" on center and so on.
Frank Cassidy IMAATO
OMMAH Registered Designer
Cassidy Residential Design
phone: (613) 834 1857
fax: (613) 834 4597
I understand people attempt to remove load walls on their own for various reasons, but something like this really warrants a professional. There are so many things to consider when doing this to ensure you and your home aren't placed at risk.
Spans depend on several variables (joist size, spacing, direction, are they engineered joists, point load transfer points, LVL beams or built up or steel I beams,...). Point loads need to be transferred to a footing large enough to carry the load above. There are limits to where you can place the new point load onto the beam below. Perhaps the basement floor needs to be cut out, excavated to form and pour a new footing for a jack post below to support a point load that falls in the middle of that beam from above? What size jack post is suitable? Footing size depends on the load above, and the makeup of the earth it is on. How will you support the load above while you are removing the load wall and working on putting in the header / beam? What directions, size, and spacing are the joist above and below? So many considerations...Are there utilities in the wall now that need to be relocated (Plumbing, electrical, HVAC)?
The cost to have an engineer complete a site inspection is about $500-$700 or so. They can tell you what you need to do for your project and then you'll have the confidence it is built right and is safe. Ensure whoever does the work for you is insured and workers are WSIB. If something happens, you want to have recourse.
Hope this helps!
Thanks for all the replies.
Reason why I asked is because I am looking into building an addition on the side of my house. The side I will be adding to is the walk out basement side of my bungalow. The addition is to include an attached garage (approx. 26Dx32W) with a bonus room above (to be the living room). The existing structure of the house is all 2x6 wall construction and a pressure treated basement.
I was wondering what the wall spacing would have to be for the upper level and what type and size of joists I would need above the garage to support the weight of the bonus room without having to divide the garage. The wall construction of the addition will be 2x6 also of course.
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