New answers tagged

5

Looks like data entry error to me. The values were reversed for several rows at some point. Considering that they spelled 'fir' as 'fire' in one case, one can assume that accuracy was not a high priority here. That's not a flush beam, either, nor is '2x8' a 'length'.


0

Are you asking whether a 2x5" joist will span 15 feet (3m)? No. It'll be a trampoline. (Or yes, but it'll be a trampoline.) Here are your options as I see them: Go with your original plan and lay it on the soil. Then you'll have critical intermediate support even with loose soil. Worst-case scenario it settles into the soil and ends up lower then it ...


0

it would be wise to pour either one contiguous slab of concrete or individual pads of concrete under the supports (leveled, of course). This will eliminate the worry of soil type


2

It has to be at least 2" away from the top, or bottom of the joist. As far as distance from the ends, there are no rules: Holes: Do not bore holes closer than 2" from joist edges, nor make them larger than 1/3 the depth of the joist. –engineering.purdue.edu, PDF If you look at the document, it clearly states and depicts the top or bottom, with no ...


0

Double 2x8's spanning 10' @ 16" O.C. can barely support 160 PSF (safely) if they are douglas fir and the spa is centered on the joist. 150 PSF over ~50 Sq. Ft. would be about 7,500 lb. As for your end beams, (3) 2x10's spanning 7' would support the weight of the joist ends with a 1.5 sq. ft. footing on each end of the beams; 4 total. Just to stiffen ...


4

The spikey washer needs to go between pieces of wood. I doubt its usefulness, since the strength is either going to come from the bolt in shear, or friction between the wood surfaces, depending on how tightly it's bolted. The teeth won't fix poor clamping. A lockwasher needs a lot of compression to function properly, it's really intended for metal. If ...


0

I just finished the project - the grout turned out be a great solution - I intend to do it again for the other side of the house. Precision work in that part of the crawlspace was quite difficult, and simple letting the grout find it's own level made things much, much easier.


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As requested, composite really needs the tighter spacing. It will sag and feel really spongy at 24".


2

Indeed, sistered boards may provide an area that is vulerable to moisture buildup and decay. However, in practice/experience the effect is not very pronounced. If I was concerned about it because of general moisture in the area, then I would use zinc paint between the joists to help reduce any mold issues. If spacing is preferred, then I'd recommend a 1/8" ...


3

Besides safety and practicality mentioned by isherwood... part of the answer is money... the size of the hanger is related to the cost of the hanger. If you make or sell hangers in bulk, then every cent matters (customers like walmart and lowes will buy the hangers that are one cent cheaper per 100 boxes). If you only need to hold a certain weight, then ...


2

Answer revised after realizing that the OP was asking specifically about top-mounted hangers. In the case of perlins, it's not usually a problem that they align slightly above the beam. Any subfloor or roofing should span that small gap without a problem. Why are the hangers not exactly 3-1/2" high inside? To give a slight margin for error with respect ...


1

Simpson Strong Tie makes an "Adjustable Truss Hanger" THA-Series.


2

Those are simple L-angle joist hangers. I'm not sure if it's appropriate to use them like that, though... especially if you plan to use the stringer to support something (other than itself). In other words, the ground-support should be directly supporting the stringer and the joists should be resting on the stringer- unless you will not be using the ...


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In case you're dealing with decay .... Sistering two joists is usually done to support a heavier load than the one for which the structure was originally built. On the other hand, if an existing joist is decaying, then there is no need to sister a second joist of the same dimensions because the new joist by itself will be sufficient. Just replace the ...


0

no - the LSU hangers sit over the end of a square cut joist or rafter. they wont work if you cut them on an angle.


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I had 8 of the ($90) knee braces made for about $70 total by purchasing the 1/4 inch steel plate from a metal recycler. For that price they cut the pieces, drilled the holes and welded them up.



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