Metal roof for the Woodshed #2: How much overhang is too much?

[FTG-05]

I agree with you that it is a woodshed, not the presidential bunker, so this is not a criticism. I just didn't see anyone answer your question about the tie plate fasteners.

At least here (can't say for your area), it would be the screws you used instead of nails. Since nails, generally, have a much higher shear strength than screws, most codes require nails (or engineered screws) to be used for all plate fasteners.

No nails were used in this woodshed build, just like the original. Well, one exception: I'll use roofing nails to hold the orange/red plastic ribbon wind indicators. That's it.

 

[LD1]

I too am wondering what keeps a strong wind gust from just lifting the structure out of the blocks?

Those blocks look like what is used for a "floating" deck. Where the post just sits in the block.

 

[ovrszd]

Well for starters his wind risk is lower than I thought from the description. He actually has somewhat of a barrier with an opening to the front left. Then add the weight of the building. So under normally expected wind conditions he'll be fine. If a severe storm blows thru that might change. But then there will be other things damaged then too.

 

[FTG-05]

I too am wondering what keeps a strong wind gust from just lifting the structure out of the blocks?

Those blocks look like what is used for a "floating" deck. Where the post just sits in the block.

They are just standard deck blocks. They have a "socket" for a 4x4 vertical column that fits into it. There is no provision whatsoever for resisting any vertical uplift forces.

So the question I have is: What prevents any structure built, using deck blocks as a foundation, from lifting and blowing away? Weight of the structure (which I have) or tying it into the existing (and anchored) structure (as I have done)?


And here are some pics of today's work. I have one bay done and ready for about 3 cords of wood. Poplar trees from my poplar grove will go here.

Also, two pics shows a diagonal reinforcement to, hopefully, counteract the uplifting forces discussed earlier. Let me know what you think.





ETA: You can also see the two plastic ribbon I installed as wind indicators. I didn't use nails here either, but two more roofing screws.

 

[FTG-05]

I agree with you that it is a woodshed, not the presidential bunker, so this is not a criticism. I just didn't see anyone answer your question about the tie plate fasteners.

At least here (can't say for your area), it would be the screws you used instead of nails. Since nails, generally, have a much higher shear strength than screws, most codes require nails (or engineered screws) to be used for all plate fasteners.

I was trying to remember where I had seen a structure built with the tie down plates using roofing screws and then I was in my pole barn shooting house and that's when I saw it. This is the interior of my pole barn. You can see the tie down plates and the roofing screws used. Not saying it makes it right, but it's been done before. And the pole barn is still here.



Tomorrow, it's supposed to rain (yea right!) so I plan to get more wind tie down plates, but this time for the back side of the header. I'll post more pics tomorrow.

 

[LD1]

That's why I didn't make a big deal about the screws.

Is it right....nope.
Does it work.....yep.
Is it gonna fail....probably not.
Is there better fasteners out there....yep.
Would it pass code (if you have to meet code)....not a chance.

Which is why I asked if you had code. No code = no worries on my book.

 

[FTG-05]

That's why I didn't make a big deal about the screws.

Is it right....nope.
Does it work.....yep.
Is it gonna fail....probably not.
Is there better fasteners out there....yep.
Would it pass code (if you have to meet code)....not a chance.

Which is why I asked if you had code. No code = no worries on my book.

I've been spending time with the Simpson Strong Tie High Wind Resistance guide and on page 54 they show a 10x1 1/2" SD Hex Head screw and a 9x1 1/2" SD Hex Head screw. I *assume* these are the screws you are referring to and are the screws that would be approved by AHJ if I so had one.

Question: I used 1 1/2" roofing screws. I *think* they're 9 ga +/-. Then you have the approved screws above. Find me the absolutely best screw for this purpose in the entire world, money is no object. $1000/screw, no problem.

Regardless of which screw chosen, they are all still going into crappy (at best) #2 pine wood at a maximum depth of 1 1/2".

What, if any, difference does it make???????? Serious question. I would understand it if we were joining 1/2" steel or something like that, but it's 1 1/2" thick wood.

When I buy the other wind straps (Simpson H2.5), I'll get some SD screws while I'm at it (at $.10 each, ouch!!!). I'll post some pics, we'll go from there.

Also, no one noticed it (or mentioned it) but the Simpson book recommends all holes be filled. I didn't do that on all tie plates. I'll fix tomorrow when I add the additional tie plates.

Thanks,

 

[LD1]

I don't do the testing or writing of the law/codes. I get what your saying. And depending on application.. u don't always use the appropriate fastner either

 

[FTG-05]

LD, what fasteners do you use on Simpson's products when building stuff like this?

 

[pmsmechanic]

You mean side-to-side? Look under the "Posted" sign and above the RTV. You'll see two 2x4x12 that go from the pole barn structure at a 45 degree angle to the joist header board. Makes the structure very solid side to side, unlike the gussets at each vertical column.

View attachment 488927View attachment 488928

I like the looks of your building. If you have a tin roof, which you do, then your diagonal bracing isn't necessary. The roof tin braces the building diagonally.

What I would do is buy some screw in anchors. If you screw one in on the inside of the building by each post and bolt the post to it, you don't need to worry about the wind lifting your roof off of the batio blocks.

ShelterLogic 3 in. Earth Anchors Set (4-Piece)-175. - The Home Depot

They are available in many different sizes and lengths.