Building a 3200 SQ FT fab/machine and automotive shop. 40'X80' with a lot of concrete work to include a custom trench drain system.
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I would Love to have a drain system like that around my shed.
Looking Good!
No itch?
Y'all got off easy. Haha.
PM sent, please do not delete your wanted advice.My unsolicited opinion. I'll delete shortly.
At the very least, itch your roof with the 3", trust me. While the 3" WMP-VR R-10 doesn't afford much, what it does do is minimize the condensation that'll accumulate on the underside of the panels. It's not the best insulation, but there are reasons why 90% of a metal buildings have it installed.
Here's what happens without the blanket sandwiched between the panel and the purlin.
Condensation will occur, even on your wall panels, and become trapped in between your R panel exterior wall and your insulated interior.
On the wall, it'll run down the inside of the panel highs right into the sheet notch. Even though not desirable, at least it has an outlet.
On the roof, it'll sweat into whatever your interior finish that the batt or other itch is supported on, become trapped, an be a nightmare down the road.
Even in an insulated metal building, water will condensate on the screw tips, inevitable corroding the fastener and the penetration point through the purlin, to the point the screw no longer grips. This may take longer than you'll own the building, but have seen this occur on structure locally that were built from late 70s into the late 80s. Literally can pull the screw through the purlin.
Granted, every climate is different, but none are impervious to dew points, and regardless of any interior barrier, it will occur on the bottoms of the sheets, be it closured roofs/walls, vented roofs/walls, condensation can even occur on the bottom of the vinyl backing in some instances.
Again, all unsolicited, but have pulled many roofs to correct these issues, some with very expensive polystyrene apply in place systems, since it's impossible to keep condensation from occurring inside the highs of the R panel.
On the buildings I own that are climate controlled, I run 2" metal banding every 3-4' on the bottom of the purlins, then run custom 4" thick roof rolls with specific backing widths and tabs in between the purlins, pulling the tabs out and sealing to the bottom of the purlin. then lay a 4" blanket only on top of the purlins, with thermal breaks in between the purlin and the clips or sheets, effectively sealing the interior from the structure above the bottom of the purlin to roof deck, plus having an uncompressed 8" of itch, affording R-26 to R-30.
Sounds extreme, but a for instance.
I can maintain a 45% RH in 36,000sf of climate controlled storage, keeping the thermostat at 72 year round, all for around $900 a month.
Talked to much to say. If you weren't considering the 3" wrap between the purlins and the roof sheets, do a little homework in your area to see the experiences of others.
Forgot where you are, but surely have someone close, in the event you'd like to talk to a local builder.
Again, don't quote and I'll delete, just hate to see a future issue not stated to be worthy of further investigation.
Nice. Downhill slide now!
Did you order with an expandable endwall or is there some code that necessitated the frame?
Using overhead doors?