QUOTE(West Wing @ Dec 1 2010, 02:55 PM)
Dear Andy,
I heard about how good your products are and friends from Singapore also told me about the good insulating properties but I haven't heard of one fellow here using your products on a BH.
Secondly, the contractor you introduced to me gave a high quotation for the BH..........so, I just stick to old way of doing BH. No offence as cost is definitely a big consideration in BH construction. If you have provided more BH contractors using your products, then, maybe, we maybe able to see results in using EPS in BH construction.
WW, I use 3" EPS on my roof.
The roof slab is laid, then the EPS sheets are placed, keeping them together with masking tape. Lastly a 2" approx. layer of reinforced concrete is poured over the EPS.
My daytime roof top temperature gets to be 40+deg. C and above, sometimes much more, but the ceiling temperature directly underneath remains a steady 30 deg.C. +- 1 deg.C
Interlocking EPS sheets would make placing much easier as wind tends to move the sheets unless quickly weighted down by BRC mesh.
2" RC is probably minimum over the EPS as if your drainage holes get blocked up, it will FLOAT. So, make sure that the drainage holes are large. I use 4 x 4" pipe even then sometimes leaves etc can block it up.
EPS under pressure can also waterproof your roof slab if it has hairline cracks, which is quite common.
EPS cost is negligable, the contractor must have charged more for other items. Because the EPS is very bulky, the transportation cost can be relatively high but then again a 8 wheeler lorry will probably add maybe Rm1k + There is hardly any expertise required to use EPS sheet insulation.
I also use 3" EPS sheets under my bungalow roof, above the ceiling boards. The roof is the notoriously hot (uninsulated)corrugated metal sheeting yet the temperature inside , even during a very hot day remains noticeably cool.
I've worked with other insulations before but none come close to EPS for price and insulating properties. Durability ! well this stuff supposedly does not degrade appreciably in our lifetime, though some insects like to bore into them. Due to it's durability, it is a biohazard so we should not be using EPS food containers, which is common practice in Malaysia.
I'm in no way connected to the above company but they are free to offer me some commission after this post. Please PM me for my bank account number.