WATER PROOFING.
Clean the surface of the slab by removing all loose materials, dust, etc.
and wash with clean water. Provide and lay a screed of CM (1:3) over the clean and damp surface including waterproofing agent mixed with
CM Total average thickness shall be 20 mm. Lay an average thickness of 115 mm consisting of brick bat layer laid in random pattern to avoid continuity of joints and 10 mm
thick bedding, 10 mm thick jointing with water proof cement mortar of (1:3). This layer shall be laid to appropriate slopes towards rain water downtake outlets already provided by Civil Contractor. This brick bat layer shall continue in rounded manner over atleast 200
mm of vertical surface of parapet walls. This layer shall be cured for minimum 3 days before taking up the next layer. The surface which is not taken up for next layer shall be continued to be cured for minimum 10 days.
Final layer : Provide and lay minimum 40 mm. thick IPS layer in cement concrete (1:2:4) with maximum size of aggregate 3 mm. to 6 mm., simultaneously with polishing trowel, using
CM (1:2) wherever necessary to hide aggregate projecting at surface level. Use waterproofing agent as approved in this layer.
Curing : This layer shall be cured for 21 days by flooding the water to 25 mm. depth in panel of 1M x 1M formed by weak cement mortar bonding.
Clean the surface to be treated and apply a coat of Cement wash using mixture
of Cement and Water in proportion (1 bag : 80 liters).
Provide and apply minimum 20 mm. thick waterproof plaster with cement mortar (1:3), finished smooth with polishing trowel, in continuation with finish layer of terrace top. This layer shall be laid over entire inside surface of parapet, taken over top of parapet in slope and continued over outside surface at least
up to 300 mm., below top of roof slab or over slab projections wherever they obstruct.
This layer shall be cured for 21 days by spreading clean Hessian / jute cloth which should be kept wet throughout the curing period.
Asphaltic bonding material : This shall consist of Air blown bitumen conforming
to IS:702. The penetration of bitumen used shall not exceed 40 in any case.
Generally blown bitumen of low penetration shall be used for the base and
intermediate layers of bonding material. Suitable Air blown bitumen are
"ESSO" Industrial Asphalt-116 or equivalent.
Self finished felt : The soft finished felt, shall be of the brand and manufacture conforming to the type and grade as described in the item. They are
fiber glass or Hessian base felts. These shall conform in all respects to IS:1322.
Stone grit : Stone grit shall conform to specifications of stone aggregate and shall be 6 mm. down size. Stone grit shall be spread uniformly at the specified volume over unit area. This shall not be spread over vertical and sloping faces and at drain mouths. At these places the surface shall be painted with two coats of bituminous solution. Where
aluminum foil finish is stipulated the same shall replace the grit.2) Hessian based self finished felt type 3 grade 1.
3) Hot dipped bitumen @ 1.2 kg/sq.m minimum.
4) Stone grit @ 0.006 Cu.m./sq.m
2) Hessian based self finished felt type 3 grade 1.
3) Hot applied Bitumen @ 1.2 Kg/sq.m minimum.
4) Hessian based self finished felt type 3 grade 1.
5) Hot applied Bitumen @ 1.2 Kg/sq.m minimum.
6) Stone grit @ 0.006 Cu.m/sq.m
2) Hessian based self finished felt type 3 grade 1.
3) Hot applied Bitumen @ 1.2 Kg/sq.m minimum.
4) Hessian based self finished felt type 3 grade 1.
5) Hot applied bitumen @ 1.2 Kg/ sq.m minimum.
6) Hessian based self finished felt type 3 grade 1.
7) Hot applied bitumen @ 1.2 Kg/ sq.m minimum.
8) Stone grit 0.006 Cu.m. /sq.m
This
is a sample Spec from Super Civil CD. For more info Contact:
Mr. Yusuf A. Agboatwala,
1802, Jamuna Amrut, 219, Patel Estate,
S. V. Road, Jogeshwari (West),
Mumbai 400102.
Phone: 26783525
Cell: 9820792254
Email: yaa@supercivilcd.com
URL: www.supercivilcd.com