Methodology for Waterproofing
abe® Index waterproofing membranes shall only be installed by contractors accredited by a.b.e.® Construction Chemicals Limited.
Care must always be taken when working with open flames, potential fire hazard, and molten bitumen from the process, employ safety equipment and clothing where necessary.
All the products are to be applied in accordance with the manufacturers instructions.
All relevant data sheets are to be carefully read for additional information.
SUBSTRATES AND FALLS
Screeds are to be sand cement laid to minimum falls of 1 in 60, the strength and thickness as per engineers specification. The moisture content is not to exceed 7 % prior to torchon applications.
Should light weight screeds be employed an additional sand cement screed is to be placed on top of the light weight screed, the strength and thickness as per engineers specification.
Under no circumstances must the torchon material be applied directly onto the light weight screeds. Special care must be given to all expansion / construction joints, refer to you’re a.b.e.® Technical Representative concerned for specific details.
- NEW ROOF
Prime all surfaces with bitu.® prime, including all verges, and around outlets and protrusions and allow the solvent to flash off. Extremely porous surfaces should be re-primed
Strip existing waterproofing before priming all surfaces with bitu.® prime, including all verges, around outlets and protrusions and allow the solvent to flash off.
Some existing waterproofing materials may be overlaid only in consultation with the a.b.e.® Technical Representative concerned
THERMAL INSULATING SYSTEMS
A thermal insulating material having a closed cell structure shall be dry laid over the Index Fidia or abe® Unigum P 4 mm waterproofing layer to engineers specification.
DRAINAGE LAYER AND STONE BALLAST
Suitable drainage to be included using abe.®drain G. To this surface apply a suitable layer of stone, size > 16 mm, the thickness a minimum of 50 mm or to engineers specification. The thickness of the stone layer should be estimated according to the thickness of the insulation panel.
a.b.e.® Index Fidia P 4 mm, South African Agrement Certified (Certificate No. 97/261)
Full bore outlets, pipe upstands to have a square metre of Index Fidia P 4 mm bonded to the surface including their gussets. All internal and external corners to have a gusset fitted, 100 mm x 200 mm, using Index Fidia P 4 mm prior to the commencement of the waterproofing application. The vertical turn up of the gusset to be a minimum of 200 mm above the maximum water level.
Apply a single layer of Index Fidia P 4 mm or abe® Unigum P 4 mm, non-woven polyester reinforced, ensuring the layer is fully bonded to the ‘bituprime’ primed surface by means of ‘torchon fusion’ using propane gas, having side and end laps of 100 mm and 150 mm respectively.
The rolls are to run parallel to each other, centrally staggered to prevent joints overlapping.
See data sheet ‘Six Golden Rules’
Counter flashing over the balance of the parapet is recommended using super laycryl or super laykold incorporating abe.® membrane, details as recommended in our data sheet. Ensure the lap over the torched membrane is at least 150 mm.
All plain exposed surfaces are to treated with 2 coats of silvakote as protection layer against UV rays. The coating should be applied 6 to 8 weeks after torching process to allow the surface to oxidise slightly thus providing good adhesion of the coating.
Specific attention must be given to the detail work when waterproofing the outlets to prevent ingress of moisture.
This data sheet is issued as a guide to the use of the product(s) concerned. Whilst a.b.e.® Construction Chemicals Limited endeavours to ensure that any advice, recommendation, specification or information is accurate and correct, the company cannot – because a.b.e.® has no direct or continuous control over where and how a.b.e.® products are applied – accept any liability either directly or indirectly arising from the use of a.b.e. products, whether or not in accordance with any advice, specification, recommendation, or information given by the company.
Where other products are to be used in conjunction with this material, the relevant technical data sheets should be consulted to determine total requirements. a.b.e.® Construction Chemicals Limited has a wealth of technical and practical experience built up over years in the company’s pursuit of excellence in building and construction technology.