[TowerTalk] 5/8 "Washers" on Bottom of Bolts

[Grant Saviers]

Sill hold down bolts have much heavier washers, I think the code has 
been "improved" twice in the past 15 years or so.  Now something like 
3x3x1/4 or larger steel plates.  Off the shelf at HD and lumber supply 
stores sized for different diameter bolts.

Grant KZ1W

On 9/27/2020 19:41, Wilson Lamb wrote:
> I'm no concrete guy, but those bolts seem short to me.
> The small heads will create high compression loads, depending on how much tension is taken out by the threads above the heads, if there are threads.
> The heads are so near the top of the block that a lot of the concrete will have to go into tension, not great.
> Just think; those little bolt heads are the only thing relied on to mobilize the strength of that giant blob of concrete.
> I'd like to see the suggestions  for alternate bolt configurations, if you can post them.
> I can't give numbers, obviously, but would like to see longer bolts, with sizeable washers.
> Fine "washers" could be made by buying some scrap plate, cutting some pieces of  4-5 sq inches and burning holes in them.
> Who knows, you might find a pile of cutoffs in the junkyard.  I think 1/2" thick would be OK, but you may find 1/4" plate more available and it could be doubled up.
> I know doing this at machine shop rates would be unreasonable and that you may prefer buying, but I enjoy such making do.
> If you haven't already bought the bolts, why not get J bolts, which solve the problem very elegantly?
> You could weld the bolts, well, maybe a trained welder could, weld the bolts to some rebar as long as you like, with a L bottom.
> WL
> 
> At this price, I'd order!  https://www.boltdepot.com/Product-Details.aspx?product=7378&gclid=CjwKCAjw8MD7BRArEiwAGZsrBeOHBCulhpbJF7fDiv6EG9_-pVo6miZR5_2MpbFMaQplnIQTS35MLxoC7DUQAvD_BwE
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