Flat Roof Waterproofing With Liquid Applied Membranes

In Greece we use mainly APP modified asphalt membranes for the waterproofing of flat roofs. The reasons for this choice are:

1) They exhibit a very good behaviour in the Greek climate.

2) They are quite reliable.

3) They are economical.

4) The installers are numerous because the initial investment is minimal and the know-how simple and widely available.

5) They are accompanied by 10-year warranties.

Despite this, there is always room for liquid waterproofing options.

Liquid waterproofing products or Liquid Applied Membranes (LAMS) have some distinctive advantages.

ADVANTAGES OF LIQUID WATERPROOFING PRODUCTS

1. They create a seamless waterproofing membrane. This is not the case with all prefabricated membranes which form joints.

2. They are highly elastomeric. In Greece and nearby countries the kings in liquid waterproofing are acrylics, modified acrylics and modified polyurethanes.

Their elongation at break often exceeds 600%.

3. They show increased bridging capabilities. When reinforced they can bridge cracks of about 1,5mm width.

4. Liquid waterproofing products can be reinforced with appropriate fabrics to form a robust, elastic and totally impermeable membrane.

The ideal reinforcement - as we found after many years of experience - is an elastic, isotropic, non woven polyesteric fabric of about 50gr/m2. This fabric can make full exploitation of the LAMs elasticity.

5. LAMs are ideal for small roofs with complicated shapes and many details: penetrations, upstands, joints etc.

6. LAMs are do-it-yourself products, easy to apply, particularly where there are no technicians available. We have this problem in many, small and isolated Greek islands.

SOME POTENTIAL PROBLEMS

1. It is not easy to guarantee the requested consumption and thickness.

2. Some LAMs (especially acrylics) are very vulnerable to stagnated water.

3. Most products need an appropriate primer. Dusty, friable, irregular and cracked substrates are generally not suitable for liquid waterproofing products.

4. Most products are prone to blistering. Substrates should be totally dry in most cases before the application.

Chris Strogilis

Civ. Eng. - MBA - DipM

http://maconwaterproofing.blogspot.com/

About the Author:
http://maconwaterproofing.blogspot.com

http://totalfitness-christos.blogspot.com

http://monosimacon.blogspot.com/

Article Originally Published On: http://www.articlesnatch.com

Tags: flat roofs

, liquid waterproofing

, waterproofing

, roofs

, LAMs

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