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:

Did you measure the temp difference?

The house should be noticable quieter also when it rains.

Useful for high roof distance to ceiling right? If low roof, useful?

Check annually for mold as moisture trap can cause that, which affects health in long term.

TS. effective or not the radiant barrier?

TS sure it's not placebo effect?

Don't have a temp. gun on hand so didn't measure, but I don't get headaches anymore for the whole week living on 2nd floor. Other family members also commented on it being noticeably cooler.

All you need is some air/insulation gap to the roof tiles, but might be hard to install if not much clearance. Mine is not a very high sloped roof design.

Roof Ventilator Wind Turbines better?

got link to the shops, ts?

Not for my case, had 2 but didn't do much for radiant heat.

For Kajang search Roofseal Bandar Teknologi Kajang.

KDK 8” fan exhaust out better. Humanly impossible size Cannot put too big like 12” easy for burglar to sneak in

TS please take note of this. Mold can easily screw your health oer time if left uncontrolled.

is the product obtained SIRIM/BOMBA certificate?

you can actually redo the ceiling with insulation, lot cheaper you know

Wont the strong wind coming inside will cause it to torn off?

Didn't become airtight because left some room for air to pass through, but will check once in a while.

Attached the catalogue for it. SIRIM, CIDB and BS 476 which is something related to fire if not mistaken.

Really? Can clarify how so?


Attached File(s)
 WF402_WOVEN_FOIL_1_.pdf ( 1.51mb ) Number of downloads: 99

Mind sharing the Melaka one?
I'm closer with it since I'm from Johor.

What is the cost vs this?

Cool

just lay the radiant reflector on ceiling there i think at least save 50% of material.

and this is just radiant reflector, your rain noise will still be there unless you add insulation layer.

The catalogue I shared has a Melaka address (supposedly comes from there I guess?)

my house 2nd floor got a room full of glass

though facing south but the side there expose to sun making the room hot though tinted

so recently i renovate the room, to put woods panel cover the window i install the foil with bubble wrap triple layer becasue 1 roll was really alot using double side sticker



RESULT

on the hottest day during noon , the room wasnt hot at all
amazing cheap solution

Bro PM links, boleh?

My guess. Before installation, temperature likely around 32c ish

After installation,.around 27ish

My 40 years old years house already comes with this thermal barrier, yup it do block direct radiant heat from the rooft shingles.

Now in some area, the barrier already crumbling down, no barrier left and I can feel the radiant heat heating up my ceiling.

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.

wait so, what the difference with heat insulation?

The roof heat insulation membrane no need bomba cert wan, only the plaster ceiling board need to be class 0, can check your state ubbl uniform building by laws

okay, will check it out.
Thanks!

what if you paint your outer rooftop with glossy white .. gonna be cooler I bet....

that look like a ventilated roof, the temperature won't get that high. the main heat flux will still be the radiant from hot roof tiles.

Basically fiberglass wool with aluminium sheet. Warehouse uses these. It's very effective.

This method has been established in building sciences. Even the cheapest material would reduce the heat somewhat. So definitely not placebo.

Parking for future reference. Macam yes

Someone posted this last month.
You dupe?

https://forum.lowyat.net/index.php?showtopic=5384462

This post has been edited by Skylinestar: Jul 3 2023, 01:55 PM

somehow.. I Agree more on this, instead put shield btm of the roof that has been exposed thru the bright sun for 8 hours or more daily... better make good of the outer layer which in my opinion will give a higher impact on the reduction temp

Not going to work for an imobile object that will get the sun’s ray for the whole day.

Yes white do reflect more energy/heat, but over time, they will still be as hot as any other colour, plus the radient heat from the object itself (tiles/bricks) will still be the contributing factor of the building’s inner heat. Well duh, they’re the only source since light don’t penetrate bricks.

Ie. Car tint’s, no matter what fuck 99.99% of full black tint you use, your windshield’s radient heat by itself will act as a huge heater in your whole car. It dosen’t matter those sohai UV test at shop u see that shine through and you no feel, matter of fact is, glass itself becomes hot, and heat radiates from it - acting as a huge heater in the afternoon.

House r value before and after Install radiant barrier?

When sell house, people emphasize no kena setting sun and not hot a lot more than you think.

If buy for investment, you want sell back also need to convince buyer right?

Another option is to install solar panel to block the heat while generating electric. But initial cost will be higher.

What happen if roof tile broken and its raining?

It's reflective so it can reflect/insulate radiation

Not planning to replace the old tiles yet, so opt for smaller but effective enough jobscope.

Definitely coincidence, the heat getting unbearable in recent years.

hardwood batten?

your house is old one?

is this Radient Barrier by Monier?

here

Reflective Roof Insulation
MF2E Class O Aluminium Foil Woven Foil (48M-L) Penebat Haba Bumbung Rumah Roof Heat Insulation Reflective Insulation

https://shope.ee/6zq2ywagin



This post has been edited by JimbeamofNRT: Jul 3 2023, 02:47 PM

Tensile strength also not bad

Also it secures your roof somewhat. Thiefs come in last time, remove the tiles and they are in. Now they have a foil to contend with and might just give up

TS is not my dupe.
He is my Believer.

LOL

PS: I found Sunfoil (https://yhlp.com.my/) kinda good. Shopee n Lazada got.



This post has been edited by ApocalypseSoon: Jul 3 2023, 02:56 PM

thx boss

these few days keep raining and cloudy.. of course "sejuk"...

Foil is waterproof but definitely not a replacement for tiles. If workmanship is tight enough will cause water to flow to edge of roof tiles.

Parent's house, pre-2000 😅. Not sure on exact brand, got catalogue on 1st page.

Yeap, too low will tear easily making it very messy during installation. This one cannot tear by hand and need scissors or knife, even then also need some effort.

Yeah landed house need to do this. Every landed house be it my parents bungalow, my in laws bungalow. 1st floor always very heaty during the day 🥵🥵

Even 1 of my new room tenant moved out from landed room rent to rent at my apartment. He say my god his room during the day like sauna so hot.

This post has been edited by max_cavalera: Jul 3 2023, 03:04 PM

hi TS,
Where is your location for the contractor? I try to find in Ipoh and their charges for the labor start from 2K to 2.5K

He's from somewhere near Nilai.

I'm actually friend with the contractor, did a few jobs already for me before so I might be getting some preferred prices. My budget for labor is actually 1-1.5k tbh.

nope. this is biggest myth ever.

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.

put rockwool above the ceiling?

Yes. Once increase the ceiling radiated barrier, no heat radiates down to the room. And the roof above gets air circulated also.

i bought Tuya/SmartLife Wifi-based Zigbee-based AAA-battery temperature+moisture sensor, put between ceiling and roof.

It's not so much about accuracy, but in preparation to compare before and after installing ventilators on the roof. At least a measure to know how effective and whether I should install more ventilators afterwards.

This post has been edited by Oltromen Ripot: Jul 3 2023, 05:12 PM

A properly done layout would have insulating film > rockwool > channel frame > tiles/shingles, but I'm not planning to spend that much. Also hate rockwool fibres.

Bit too late for comparison 😅, but isn't it annoying though to have battery powered devices above your ceilings?

i open the ceiling hatches and just place nearby it, expecting needing to change battery from time to time.
at least for a few months while waiting for ventilator stock to appear.

i'm sorry. it's zigbee.
i check battery just now. both sensors' batteries still 100% since installed early June.

bomba approve or not?
later ur house kena fire and insurance dont pay how?

hmm

Definitely very effective . I’ve done it as well

Sunfoil is my conclusion too after discussing with sifu above 👍

very hard to detect if roof got crack after put that

oh, can install even if roof already siap. i thought this thing can only install during house construction

pasang atap liddat only mana tak panas...lulz.

Hi, sorry for necro old post. But am interested to know if the insulation barrier is fire resistant or not?

Also it is just an "alumnium foil", no insulation material in between? What is it made of?

Got product catalogue at post #17. Any further details can try asking the supplier directly.

more info here:
https://www.roofseal.com.my/product/fire-retardant-series/

before installing the radiant barrier, I had painted the roof with nippon solaroof, and felt the difference. it became even cooler after installation of the radiant barrier. I have no thermometer and so did not take before and after temperature readings; can only base my impressions on the "feels".

Oh nice. Thanks

Do they do installation as well?

This post has been edited by hoonanoo: Oct 23 2024, 11:42 AM

thanks

Most new house are being built with this.

oh no wonder, dulu atap telanjang, mmng panas

good developer mmng use insulation materials for heat and sound isolation

so tak jadi mcm kereta tin kosong bila kena hujan itu machiem

My 35 years old hour already comes with this aluminium heat barrier. Comfy during hot days. But lately, the barrier base material starts to crumble down.

Can see few patches with no barrier intact.

Need to redo the barrier with new one.

Just to check. Is there a company or service out there that can handle everything from A to Z with a budget friendly option?

The installation does not require any special skills + the materials do not require any lead time to purchase (if only to use in 1 house).

Just need to find some contractors who's familiar with roofing works, show them the video and ask them if they're comfortable to do it.

Worry this
I think better attach above ceiling board ?

Can, but if your roof part do not have its own insulation anybody in the future do work between roof-ceiling gonna get cooked inside (wiring, plumbing near water tank, etc.).