Hello - FINALLY got started on my 28x42 2 story, 3 car, semi-attached (2 story finished breezeway) garage. First floor walls are up, floor trusses and deck sheeting are on. Working on slab prep while the roof trusses are finished up. A few questions. I am planning a separate drain at the front (5' in from OHD) of each of the 3 stalls - going straight out the side to daylight (AHJ approved as I'm on an acreage).
Looking for ideas/best practices on daylighting the drain, and also integrating a catch basin for sludge collection. My initial thought was 3 separate trench drains, then a catch basin between the last drain and the outside wall. I'm now leaning towards eliminating the trench on last drain and making it a square drain/catch basin combo?
Concerns are:
1) Do I want a catch basin for sludge collection (1/2 mile gravel road to highway - plus our long driveway/lane - both get messy in spring/fall. Will the catch basin smell? I don't mind occasional cleaning if it makes the system work better?
2) If yes on catch basin - the depth required will be significant. My 3' long trench drains are plumbed out the bottom, so with proper fall the bottom of my 3" pipe is about 16" down from top of slab on the last drain. Deeper than I'd like for catch basin -but will still work with my exterior grade. Suggestions for specific catch basin with clean out basket and sources to acquire?
3) If yes on catch basin - how high do I want the drain pipe going out relative to the bottom of collection pit?
4) Concerned about cold air/insects/rodents coming in the open end of the drain pipe outside. Don't think I can use a trap as it will likely freeze up- faces North and we can have fairly harsh winters here. Wondered if an outlet screen would cause it to freeze up also? Thought of using some type of flapper/gate valve/backflow preventer - right on the output side of catch basin? Also considered a manual blade gate that I could just open when washing things out? I doubt winter melt off is going to fill the whole system to capacity in a short time?
This is a Parking Garage - not a workshop. 3 daily use cars, may occasional rinse the sludge off inside in the winter - but this will not be a full on regularly used wash bay. What am I missing/not thinking about
Thanks for any input!
Looking for ideas/best practices on daylighting the drain, and also integrating a catch basin for sludge collection. My initial thought was 3 separate trench drains, then a catch basin between the last drain and the outside wall. I'm now leaning towards eliminating the trench on last drain and making it a square drain/catch basin combo?
Concerns are:
1) Do I want a catch basin for sludge collection (1/2 mile gravel road to highway - plus our long driveway/lane - both get messy in spring/fall. Will the catch basin smell? I don't mind occasional cleaning if it makes the system work better?
2) If yes on catch basin - the depth required will be significant. My 3' long trench drains are plumbed out the bottom, so with proper fall the bottom of my 3" pipe is about 16" down from top of slab on the last drain. Deeper than I'd like for catch basin -but will still work with my exterior grade. Suggestions for specific catch basin with clean out basket and sources to acquire?
3) If yes on catch basin - how high do I want the drain pipe going out relative to the bottom of collection pit?
4) Concerned about cold air/insects/rodents coming in the open end of the drain pipe outside. Don't think I can use a trap as it will likely freeze up- faces North and we can have fairly harsh winters here. Wondered if an outlet screen would cause it to freeze up also? Thought of using some type of flapper/gate valve/backflow preventer - right on the output side of catch basin? Also considered a manual blade gate that I could just open when washing things out? I doubt winter melt off is going to fill the whole system to capacity in a short time?
This is a Parking Garage - not a workshop. 3 daily use cars, may occasional rinse the sludge off inside in the winter - but this will not be a full on regularly used wash bay. What am I missing/not thinking about
Thanks for any input!