Let me show you the steps we took to keep this spray booth pit dry.
First, we used a grinder to cut off the wall ties, and then covered them with a mastic.
Next, we sprayed both the walls and the footer with rubberized asphalt.
The guys use a special gauge to make sure their spraying the right thickness- around 60 mils.
Here you can see what it looks like completely waterproofed.
About 24 hours later it was dry enough to backfill.
The space between the pit and the firewall was really tight so it was the perfect job for my Ventrac.
The plans called for this area to be filled with crushed stone.
Crush stone won’t settle like dirt and will allow any water that gets trapped against the wall to drain down to the bottom.
Drains aren’t allowed in spray booths because they would allow fumes to escape to the outside and could also affect the vacuum of the exhaust system.
The good new is that we’ve had tons of rain the past couple of days and it has stayed completely dry.
Let me know how much you think it costs to have the walls sprayed. @hausplans
#build #building #howto #waterproofing #spraybooth #pit #construction #diy #contractor #tractor #ventrac
