| The PermEntry Basement Entry is an engineered system which requires
proper foundation preparation, drainage, backfilling and grading to ensure a satisfactory
installation. The following steps are necessary for optimum performance:
1.
Foundation Preparation:
-
1.a) Width of opening in foundation shall be 40" maximum width for all Types.
-
2.b) The foundation walls shall be smooth, clean, dry, and free of all coatings within
12 inches of the opening for the PermEntry unit.
-
3.c) The footing shall be clean and dry.
-
4.d) When foundation is backfilled, leave
minimum work area for PermEntry installation as shown in documentation.
2. Footing Drainage:
-
1.a) Footing drains extend at least a minimum of 12 inches beyond the outside edge of
the footing shall be installed according to approved methods.
-
2.b) Footing drains of washed gravel, or crushed stone, should be installed with the bottom
of the washed gravel, or crushed stone, even with, or below the bottom of the
wall footings, and extending up at least 6 inches above the top of the footing. The top of the
washed gravel or crushed stone shall be covered with an appropriate filter membrane
material.
-
3.c) When drain tile or perforated pipe is used, the bottom shall be placed higher than
the floor elevation. The top of the open joints and perforations shall be protected by an
approved filter membrane material, and the drainage tiles or perforated pipe shall be
placed on a minimum of 2 inches of washed gravel or crushed stone at least one sieve size
large than the tile joint opening or perforation and covered with not less than 6 inches
of the
same material.
-
4.d) For more information, please refer to the BOCA National Building Code/1990, Section
1224.5.2, or CABO ONE and TWO FAMILY DWELLING CODE, 1989 Edition, Section R-305.1, or
local building codes.
3. Backfilling:
-
1.a) All construction debris, including cardboard, insulation, scraps of wood and all
other debris shall be removed from under and around the PermEntry unit to eliminate voids
and permit compacted backfilling.
-
2.b) Soils used in backfilling shall be free of organic material, construction debris
and large rocks. Use only coarse clean sand (no silt or clay), washed gravel, or crushed
stone. Tamp backfill every 24 inches to assure tight compacture.
4. Site Grading:
- 1.a) The PermEntry unit shall be not less than 2 inches above the finished grade, with 4
inches recommended, and the surrounding earth shall be pitched away from the unit to
shed water.
|
