Disclaimer: Not a sponsored post. Just sharing a project done last week.

So the house that I'm living in is a corner lot facing the setting sun, the radiant heat during evening can be very unbearable & headache inducing. 
Wanted to do some low cost project this year to make it cooler somehow, some ideas that I thought of:

1. Install roof turbine (Installed previously, didn't help much)
2. Install some buffer / facade wall / agriculture netting on the outside (mounting issue)
3. Time-based water sprinkler on the outside (mouldy walls)

Decided to do a radiant barrier installation on the roof instead. How I did was:

1. Purchase material rolls directly from supplier (Find supplier from Shopee/Lazada and contact them to do pickup orders), comes in ~40-48m per rolls. Found 3 suppliers, 1 in Kajang, 1 P. Pinang & 1 Melaka. Just find the closest to you.
2. Find contractor to do roofing works, show video instruction on how to do.
3. 1 / 2 days job depending on roof size / design, contractor provide tools & labour.



Feedbacks & comments:
1. Cost = RM170/roll for 48m roll, bought 4 only used up 2.75 (House buildup 30*65). Labour+tools = Rm700
Total cost RM1.4k-ish. Not sure yet what to do with the leftovers.

2. Good quality product, does not tear easily (woven) and warranty is 15 years.

3. Workmanship not that important (could be better aesthetically, but not as important to serve intended purpose) 

4. Pretty good results for a low-cost passive solution (no numerical temp. measurement done before / after, but 2nd floor is noticeably cooler in the evening) 


Some pics for reference:

This will save some cost but wont be as effective to shield the heat. Shielding below the roof tile will stop the radiation from heating the air in the roof thus reducing the heat transfer in both radiation and conduction. If you shield only the ceiling, the heat from the roof tiles will heat up the air in the roof area and trap the heat become like greenhouse.

This not that so effective as the foil trap the hot air inside and gradually temp going up.

The most effective is to increase the ceiling insulation. This can be DIY easilly with rockwool.