Attaching Stuff [RE-wrenches]

[Dean T. Newberry]

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Hi y'All,

I just use standard self tapping stainless 1/4" Flange screws for 
attaching feet to the purlins on a steel building. This is the 
recommendation of Butler Buildings, the manufacturer. They provided all 
the loading and wind calcs for the building department, with no 
additional cost to the customer.

For some tile roof on 2x joist jobs, I have been using 1/2" Anchor 
Bolts. available in both stainless and zinc plated steel. My roofer 
supplied lead flashings for the anchor bolts. He caulked the anchor 
bolt/ flashing joint by crimping the lead and caulking with urethane caulk.

For flat roofs that will take the load we are just doing a ballasted 
system.  Around here the code requires the system to resist 80 mph 
winds, that translates to 10lbs / sqft of lift. KC panels are about 10 
watts/sqft, so I ballast 1lb / watt. Concrete parking blocks are cheap 
and heavy, they have holes for anchor bolts which can be epoxied in. For 
a foam roof we add a pressure treated 2x12 under the parking  blocks to 
spread the load so as not to crush the foam. Be sure not to exceed the 
16lbs / sqft live load allwoance for roofing. Your local structural 
engineer can document this for you. I have a couple of crane companies 
in the area that will swing stuff onto a roof for about $200/ job, don't 
stack it too close together when loading the roof.

cul  deant at dcn.org

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