Frequently Asked Questions
The forming lumber should to be the full depth of the proposed concrete, the sub-grade needs to be stiff compacted soils, and the inspection needs to be called in the day before you place, and all formwork must be completed before the inspection.
Compacted DGA (Dense graded aggregate) is recommended for use under driveway aprons and sidewalks.
A minimum 4000 psi, 6% air entrained concrete placed at a 4 inch maximum slump, must be use.
Our standard is 4 feet from the back of curb unless otherwise approved.
The sidewalk profile should follow the street, the cross-slope is ¼ inch per foot or 1 inch in the 4 foot width.
The front edge of the sidewalk should be 4 inches above the curb on the front edge and 5 inches above the curb on the back side of the walk. The sidewalk can fall either toward or away from the street.
Installation depth can be dependent on several factors. Check with your engineer for their design.
Granular fill is required. Pipe installation specification ASTM D 2321 will tell you how much compaction effort is needed for different soil types.
Yes. ASTM D 2321 is the required pipe installation specification. Within the R/W there are additional requirements for compaction of the trench backfill material above the pipe.
Due to the hydraulic calculation preformed by the engineer, we are not at liberty to very from pipe types called out on the plans. Changes must come through the design engineer.
Every structure 4 feet and deeper measured from the outlet invert to the top of the casting must have steps 12 inches oc.
Do to the inability to install steps in the 2x2, depth is limited to 3 feet.
No, the pipe must meet current sub-reg specifications such as perforated SDR 35.
Only under sidewalks, all other sub-grade preparations must be uniformly compacted clayey soils.
Yes, a hot pour elastic type sealant or approved equal is required.