Exterior Walls & Weight Question

Tangman · #1 10-23-2006, 04:18 AM

What suggestions would you have to increase the strength?
The I-joists have to cross the foundation at 90 degrees. I doubt there is anything they could do to increase the strength. After all I-josits are already enginered.
Yes, they are engineered, but not for point loading ,ie:having all the weight in one spot

Do you work in the industry Tangman? YES What are you basing your opinion on?

I guess the real question is would it be any different then having the tank located somewhere else within the house as it would only be supported by i-joists unless you located it over a beam or reinforced the i-joist from below. First off, the cantilever is free slung out side the house with no support underneath, other than the I-joists. this is why Chin_Lee suggested the supporting the out side edge of the cantilever. Also as I already said I-joist are not engineered for point loading , squash blocks ( 2X10's) must be used beside I-joists between squash points ( bearing walls)

What do you suggest

Thanks

mr_alberta · #2 10-23-2006, 04:30 AM

Can you get the builder to double up the joists in that location? How much of a cantilever are we talking about?

Tarolisol · #3 10-23-2006, 04:38 AM

I have a rather heavy piano in my cantilever, as im sure many others have as well. And its been there for years, im sure it weighs as much as a tank.

Farrmanchu · #4 10-23-2006, 05:12 AM

Check with Chemaster, I think his tank sits partially outside the foundation, and he had some beefing up done before putting the tank in.

Dale · #5 10-23-2006, 07:08 AM

I've had a 6', 140G. tank sitting in my cantilever for a year now without a problem. Consider that it will weigh in at just over 1000lb's - or the weight of five big guys. Will the cantilever collapse if five big guys stand in it? As suggested the tank sits on a load bearing wall and if your tank is say, 20" wide only 16" actually protrude beyond the wall itself. That 16" is cantilevered which means it is supported by the load bearing wall.
here's a pic:

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Josh24 · #6 10-24-2006, 12:02 AM

Thanks Dale I doubt my tank would exceed 140 gallons.
Have you noticed an increase in bounce in your floors?

Dale · #7 10-24-2006, 04:19 AM

No, but then again - I haven't pile driven my kids in awhile

If you think of a cantilever like a seesaw, with the load bearing wall as the fulcrum, you will see how hard it would be to collapse it. It's like sitting 1.5 feet away from the middle and trying to lift someone up. The only way to drop your end is to collapse the load bearing wall.
Good luck, take some pics.
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