What's the best white paint to reflect sunlight radiation (heat)?

[GammaGlobulin]

Dear folks,

 

I am now planning to completely board-up my bedroom windows...with plywood....painted with white paint.

 

The purpose is two-fold.

 

a.  I want to reduce sound transmission into my bedroom.

b.  I want to reduce radiation from the sun which heats up my room, and costs me extra money just by making my AC work harder.

 

So then, in Thailand, what is the brand of paint which is most reflective?

 

Speaking of radiation, nobody likes this.

 

 

 

I need to block all radiation, except for the neutrinos, from the sun getting into my bedroom, not only visible light but also infrared.

 

So, what is the best brand of paint available here in Thailand?

 

Thank you.

 

Gamma

 

 

Edited 9 hours ago by GammaGlobulin

[degrub]

You need plywood with foil on one side to block re-radiation of infrared. Paint by itself will reduce the heat transfer by a little bit only. There is still significant amount of conductive heat transfer through the plywood because the white surface of the plywood heats up.
 

Foil side on plywood must be facing interior and only exposed to dead calm air to minimize convective heat transfer. Ideally, this would on the inside face of the roof as well if there is not an apartment above yours. 
 

Actually, the better location for the foil is the inside face of the window glazing. Then you don’t need any painting at all. Install the noise absorbing plywood mass so that there is an air gap to the glazing. Caulk the gaps around the edges to block the significant sound leakage through cracks. You must use thick , stiff plywood to get enough mass and avoid a diaphragm effect ( think speakers). Probably 15 or 20 mm with thickness higher for longer spans. Also, you can screw on a strong-back stiffener , maybe 50x50 mm if both dimensions of the glazing are long.

if you paint the outer face of the plywood, look for a white coating designed to be applied to flat roofs. Otherwise , any white paint with high TiO2 content. 
 

The room walls and structural bits in contact with each other will conduct heat from the outside to the inside surface of the room walls no matter what you do with the windows. Air leakage through the wall component joint gaps will bring in heat and moisture as well. If the outside surface is masonry, it will contimue to radiate heat long after the sun goes down, particularly on West facing walls.

 

 

Maybe it would be easier to move ?

 

Edited 6 hours ago by degrub

[GammaGlobulin]

4 hours ago, degrub said:

You need plywood with foil on one side to block re-radiation of infrared. Paint by itself will reduce the heat transfer by a little bit only. There is still significant amount of conductive heat transfer through the plywood because the white surface of the plywood heats up.
 

Foil side on plywood must be facing interior and only exposed to dead calm air to minimize convective heat transfer. Ideally, this would on the inside face of the roof as well if there is not an apartment above yours. 
 

Actually, the better location for the foil is the inside face of the window glazing. Then you don’t need any painting at all. Install the noise absorbing plywood mass so that there is an air gap to the glazing. Caulk the gaps around the edges to block the significant sound leakage through cracks. You must use thick , stiff plywood to get enough mass and avoid a diaphragm effect ( think speakers). Probably 15 or 20 mm with thickness higher for longer spans. Also, you can screw on a strong-back stiffener , maybe 50x50 mm if both dimensions of the glazing are long.

if you paint the outer face of the plywood, look for a white coating designed to be applied to flat roofs. Otherwise , any white paint with high TiO2 content. 
 

The room walls and structural bits in contact with each other will conduct heat from the outside to the inside surface of the room walls no matter what you do with the windows. Air leakage through the wall component joint gaps will bring in heat and moisture as well. If the outside surface is masonry, it will contimue to radiate heat long after the sun goes down, particularly on West facing walls.

 

 

Maybe it would be easier to move ?

 

 

Thanks.

Good advice.

 

I was thinking of buying a space blanket and attaching it to the underside.

I know I need a reflective paint, as well....

 

 

[SAFETY FIRST]

7 hours ago, GammaGlobulin said:

Dear folks,

I miss your Linux topic 😞

[GammaGlobulin]

1 minute ago, SAFETY FIRST said:

I miss your Linux topic 😞

 

Sorry.

But, we can't have everything in life.

Obviously.