foil board insulation vs panda wrap

[Herb & Suds]

these reflect a ton of light with the reflective material right? im in the process of putting these ones up right now.

im using the 2 inch thick ones with the reflective facing inside the grow room. i do like them too cause theyre not stiff

Actually flat white paint puts out more

 

[TintEastwood]

these reflect a ton of light with the reflective material right? im in the process of putting these ones up right now.

im using the 2 inch thick ones with the reflective facing inside the grow room. i do like them too cause theyre not stiff

Indeed. The foil side reflects. But how it compares I do not know.

Does the 2" block 100% light with foil inside?

Here showing it's not 100% lightproof. The foil is outside with no panda on the inside. 1 1/2" thick.

 

[thumper60]

Indeed. The foil side reflects. But how it compares I do not know.

Does the 2" block 100% light with foil inside?

Here showing it's not 100% lightproof. The foil is outside with no panda on the inside. 1 1/2" thick.
View attachment 4781105

Ya thats the styroform stuff one wants the high Density Foamed sheets nice thick foil on both sides no need for Mylar.No light gets thur this stuff not even 1/2 in.

 

[xox]

i think you should move your styrofoam with the reflective layer to the exterior so you can achieve your desired r value and strap the styro and then attach your vinyl siding to the strapping. id say do mold resistant drywall inside or cement board or even some sort of glasroc product

 

[newbplantgrower420]

Actually flat white paint puts out more

Indeed. The foil side reflects. But how it compares I do not know.

Does the 2" block 100% light with foil inside?

Here showing it's not 100% lightproof. The foil is outside with no panda on the inside. 1 1/2" thick.
View attachment 4781105

so ideally.... the foil side is supposed to face towards the wall and not the grow room?

then probably staple some mylar sheets or panda film onto the other side for light reflection?

thought all these years that the foil side probably reflected 90% of light lmao.

 

[TintEastwood]

Using the super cheap stuff here.
Originally, I built this as a dry box. To dry my outdoor grow.
Did not care about reflectivity. Foil exterior look better in my garage.

So when I started turning it into a grow room, I lined the inside with panda/orca.
Durability wise, the foil on this stuff I'm using is weak sauce. Easily punctured, separates from the underlying foam, etc..

 

[xIPhobiaIx]

As the panda film has great light diffusion and reflectivity compared to the foil insulation and this being a sealed grow room I will 100% put it as the last layer towards the inside of the room.

Now my only real question is whether plastic wrap will be needed between the foam board and faced fiberglass... I do know that this will create a double vapor barrier or actually kind of a triple vapor barrier as the insulation is faced, plus the plastic, than later the panda on top.

Don't want to create trapped moisture INBETWEEN any of the insulation layers. The idea is to trap the moisture in the room completely and regulate through exhaust and or dehumidifier. I need the sealed room due the fact I will be adding CO2 to it.

 

[xIPhobiaIx]

Bump

 

[xox]

As the panda film has great light diffusion and reflectivity compared to the foil insulation and this being a sealed grow room I will 100% put it as the last layer towards the inside of the room.

Now my only real question is whether plastic wrap will be needed between the foam board and faced fiberglass... I do know that this will create a double vapor barrier or actually kind of a triple vapor barrier as the insulation is faced, plus the plastic, than later the panda on top.

Don't want to create trapped moisture INBETWEEN any of the insulation layers. The idea is to trap the moisture in the room completely and regulate through exhaust and or dehumidifier. I need the sealed room due the fact I will be adding CO2 to it.

im a licensed carpenter where i live. i commented earlier but you ignored my comment lol, yes you need a vapour barrier wherever there is insulation. dont forget to put accoustic sealant befor putting the vapour barrier. if you still need to put the vapour barrier up theres still time to put the styrofoam on the outside of the building rather than the inside but hey what do i know.

 

[xIPhobiaIx]

im a licensed carpenter where i live. i commented earlier but you ignored my comment lol, yes you need a vapour barrier wherever there is insulation. dont forget to put accoustic sealant befor putting the vapour barrier. if you still need to put the vapour barrier up theres still time to put the styrofoam on the outside of the building rather than the inside but hey what do i know.

lol didnt mean to ignore your comment. the vinyl and plywood are already in place as this is an already constructed shed from years ago so the foam will have to go on the inside. the acoustic sealant would go in between or on top of what?

 

[xox]

ah the siding is already on the building thats a bummer. normally the styrofoam goes on the exterior before the siding is installed.

you put the batts of insulation in the walls cavities, put accoustic sealant around edges of walls and openings ie. windows doors bottom plate top plate etc. staple your vapour barrier to you framing. normally styrofoam goes on the outside of the building however in your case i dont think it would hurt to have the styrofoam installed infront of the vapour barrier just make sure to use the screws with those plastic washers to screw the styrofoam to you framing and make sure to tape all your joints. i would still finish the interior of the garage with something more durable than the styrofoam. anything you can paint a flat white would be great for reflection for your plants

 

[myke]

I think the trick here is to not let the heat of the lights shine on the ext walls,so an air gap between is needed.Basically you need a room inside the room lol.