Hi all,

I want to install heat insulator and zinc sheet on the roof for security purpose.
I was quoted as below:

"The length of your house should be 50 feet because the standard set back is 20 feet.
I presumed the length of your 1st floor is about 47 feet.
Ceiling area is approximately 940FS
Therefore, roof area is 20'x51'x1.12 (extra 4 feet for roof eave and extra 12% for gradient length) = 1140FS
The thermal insulation (cellulose) system is RM3,208.00 and roof security system (using zinc sheet only) is RM3,734.00"

That would be RM2.81psf for the cellulose insulation and RM3.28psf for zinc sheet.
Would it be expensive?
Currently I was also offered RM2.60psf for rockwool insulation.

Would appreciate any feedback from you all on the:
1. pros & cons of rockwool vs cellulose,
2. the pricing on zinc sheet. <-- does it have different grade?

Not yet install. But from my survey and feedback, it is quite effective to install them on the roof.
Pricewise, I'm comparing them. Price will definitely go up year by year. Rockwool was RM 2.60 psf on 2008, RM 2.80 psf on 2009, and next year...you decide.

As for cellulose insulator, not sure it is better as in long term and value for money than rockwool.
Cellulose is made from papers and chemical.
Rockwool is spun from melted rock.
Both of them are fire-retardent, which is good for prevent fire spreadout on your roof.

Any cellulose user here?

@PJusa
That reflecting roof foil, is it termed as radiant barrier?

@PJusa
I thought CSR only do coolbatts rockwool installation. How much they quote you at that time psf?

It is supposed to prevent direct heat into your house, so that you will require lesser air-conditioning in cooling down the room to your desired level. You still need the right air-cond to cool down the room in respect to your room size. Else the cold air won't reach the other end of the room. These heat insulators are costly, but for long term...I think it worths the penny. Just that now I not certain rockwool or cellulose better in long term. Cellulose might be dusty after the chemical tears up due to the fact it is made from papers. Rockwool is made from melted rock and spun into fine thread.

@Calmman
You can always ask them to come over and measure your ceiling then quote you the pricing.

@easyperson
Roof insulation will definitely help, every single item that will help in reducing heat. This include installing a ventilator turbine combined with insulator to dissipate heat faster in the roof. As for wall, you might want to consider those sunlight reflective coating paint. I'm not certain on the effectiveness though as time passes due to the fact that rain and dust will reduce the reflective surface. No?

There question I'm seeking here is:
Cellulose insulation better or Rockwool insulation better in long run?

(As in my first post, but I'm glad that many people start to have interest in such product.)