How Much Material Do I Need For My EPDM Roof?

Introduction

This helpful article will give you a quick, easy and precise explanation of how much of each ClassicBond EPDM product you will need; membrane, adhesive, primer, etc. to complete your installation.

Step 1.

Measure your roof.

It goes without saying that smaller roofs will need less of our materials while larger roofs will need more, calculating this precisely yourself however may prove difficult. This is why we have produced a table that will help you calculate exactly how much of each material you will need, how much it will weigh and the cheapest combination of products you can buy to fulfil your requirements. Measuring your square/rectangle roof is simple, select a corner and measure along one end of it, and then the other.

If your roof is in an L sort of shape, then all you need to do is measure along both ends of the long corner as if it were a square roof and then find out the length of the parts of your roof that make the L indent so to speak, then multiply them to get the area of the indent section. Finally you must subtract the area of the indent section from the square area you calculated at the beginning.

Step 2.

Use the table below for a calculation of material quantities you will need depending on your roof size.

One 5 litre tub of our water acrylic adhesive will cover approximately 20 square meters and a 2.5 litre tub of our bonding adhesive will have a coverage of 5 square meters. If your roof is over 100m², please contact us directly to discuss your requirements. 

Step 3.

Determine what your edges terminate to. Are there walls, gutters or another roof? Some of the potential requirements:

Wall Upstand – this roof edge will terminate minimum 150mm up the wall

Gutter Drip – water will run off into the gutter with a roof trim

Check Kerb – this edge terminates to the edge of the roof where the water can’t run off

Running onto the Roof – this edge will terminate underneath another roof that slopes onto this one

Mansard Edge – this edge runs onto another sloping or tiled roof

Membrane Joint – this is where you would join to another section of rubber roof

Joint to Next Roof - this is where you would join to another flat roof surface.

Step 4.

For a comprehensive calculation of all the necessary trims and accessories, please click here