| Topic : Waterproofing Techniques |
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Construction Planning & Management
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Activity:
Question posted: 08 08 2010 05:39:38 +0000,
5 answers, 1193 views, last activity
04 07 2013 18:25:58 +0000
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We have used EPDM waterproofing system on the building roof in one of the project and we have loosely laid the EPDM. The Geotextile is laid after the surface preparation and above that EPDM is loosely laid. The roof has somany foundation projected for auxiliary services. Hence there is lot of patch work. The ponding test have been conducted on the loosely laid EPDM and same has failed. Therefore I would like to know:-
- What is the correct method of application ?
- When the ponding test should be conducted prior to screed concreting or after screed concreting?
- What should be level of water for ponding test?
EPDM membrane is one of the most modern technologies available in the world. however, you need to remember, only EPDM does not waterproof. you need the correct accessories and the correct contractor to do it.
EPDM is loosely laid for covered roofs and fully bonded for exposed roofs.
In case of UNITECh project, the contacrtor as well as the manufacturing company of EPDM did not use the required accessories.
Please visit FIRESTONE BUILDING PRODUCTS WEBSITE for the correct methodology and system
FIRESTONE IN INDIA has completed more than 500000 Sqm of EPDM membrane for ROOF, BASEMENT and LINING. They are successful projects.
EPDM waterproofing should be carried out only on a smooth surface. There should not be any protrusion or depression over the surface for a perfect laying. Adhesives used should be evenly applied and bonded before it becomes dry. If you have a mother slab with protrusion or foundation projections like what you said, it would be advisable to go for waterproofing with polymer membrane system other than APP or EPDM.
Narayan.
Tuffcoats
EPDM WATERPROOFING is foolproof only with following conditions :
1. The application surface should be smooth , levelled & should not have depressions. This allows the EPDM membrane to fully cling to the base surface .
2. The adhesive should be applied absolutely in uniform thickness , avoiding air pockets & bulge zones , thus becoming puncture prone.
3. Once you lay the membrane sheet, proper rolling should be done at uniform pressure & speed.
4. EPDM laid surface on accessible roofs should be covered with screed concrete in suitable gradient towards discharge drain outlets.
5.The laying of concrete should be done carefully preventing the fall of aggregates from height on EPDM sheet to prevent puncture.
6.The foot trafic before should not have spiked shoes.
7. Tools , Tackles, sharp instruments need to be handled carefully while on EPDM membrane, thereby preventing their fall.
You are right Asmita,we have also used the product with great hope,but at most of the places,the product has miserably failed in providing foolproof waterproofing treatment.
I would also be interested in the answers. This seemingly simple failsafe application does not work all the time.
What could we be doing wrong?
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I need methodology of EPDM waterproofing system.Can you help me. |