Attic insulation with recovery and recycling of plastics

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stratofred
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Attic insulation with recovery and recycling of plastics




by stratofred » 23/11/22, 09:25

Hello,
I'm new to the site, and I find it very informative.
here is my topic
Improve my attic insulation, with recovery. Industrial.
Let me explain :
I have the possibility of recovering, free of charge, via my employer, packaging which is in fact,
Plastic boxes (polypro approx. 3mm thick). These packages have the shape of elongated boxes and are around 60 cm long by 20 wide and 15 high. They consist of large flaps and once closed / taped they are almost waterproof.
My question and the following:
If I cover my attic (at floor level), with mounted boxes, taped, and tight against each other (layout to be done!). I'm going to put layers of trapped air as insulation (large layers, of course…).
According to you, can I really gain in insulation with this type of DIY, taking into account that the cost will be ZERO (just a little elbow grease!).
Here is if necessary I can make you a diagram.
Thank you in advance for your ideas and discussions.
Fred
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Christophe
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Re: Attic insulation with salvage and salvage/recycling




by Christophe » 23/11/22, 10:15

Hi and welcome here...

For starters, just because it's plastic doesn't mean it's a good insulator. Air must be trapped in the material to make it an insulator. There are several methods for this. A large plastic box will insulate almost nothing because convection will occur there.

Another example: bubble wrap insulates almost nothing despite the air bubbles.

So first question: what do your PP boxes look like? Post some pictures please.
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Re: Attic insulation with salvage and salvage/recycling




by izentrop » 23/11/22, 10:23

Hello,
Would need a photo. Otherwise no more than thin insulation, like little.
The optimum for an air gap should be within 20 mm
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Re: Attic insulation with recovery and recycling of plastics




by Christophe » 23/11/22, 10:34

40mm is the optimal thickness if the air is stabilized in height...AND if the radiation is blocked (thin insulation or...survival blanket)

See this thread from 2009: heating-insulating / isolating-of-walls-vertical-with-blade-and-air-and batten-t8971.html
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Re: Attic insulation with recovery and recycling of plastics




by Remundo » 23/11/22, 11:11

what I do at home.

1) I double the walls from the inside by screwing 63 x 38 mm joists (or 40 x 60 mm depending on what you find).

2) horizontal joists prevent updrafts, 2-3 depending on the height of your wall (I usually put 3, it divides every 60-70 cm in height for a ceiling at 2m50). For a basement, 1 or 2 halfway up. This is to avoid convection phenomena in the wall.

3) in the small boxes, I glue or I staple thin multilayer aluminum insulation: this insulation has the role of blocking infrared, while the 40 mm of air block thermal conduction.

4) I pass all the power lines and ground conductors that are missing

5) I cover the joists with OSB3 or chipboard.

here to illustrate the photo of a construction site in 2018

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with the kind collaboration of my daughter : Oops:

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Re: Attic insulation with recovery and recycling of plastics




by Christophe » 23/11/22, 11:42

Ah well done Remundo!

Here, this lathing vaguely reminds me of another construction site to insulate the forum of this summer! : Mrgreen:

Looks like you've been trained well! For once there is one who (me) listens to the advice of the forum ! Hehe! 8)

Just a downside to your step 3, in your place I would have placed thin insulation over the entire surface, ie joists included (it would have made an integral vapor barrier).

Why did you use OSB or MDF panels and not placo for the "finishing" walls?

Do you have any ideas of comparative performance like this from 2018?

ps: you should copy paste this message in this old topic: heating-insulating / isolating-of-walls-vertical-with-blade-and-air-and batten-t8971.html

reps: I see that the succession is assured! How many screws did she screw in? 8) : Mrgreen:
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Re: Attic insulation with recovery and recycling of plastics




by Remundo » 23/11/22, 11:58

I don't really like plaster, but it is possible to put some too.

Wood is a better insulator than plaster and you can screw yourself into it directly.

I had tried to put the insulation first but I gave up: first my joists were no longer straight/flattened, and when I screwed, the thin insulation twisted/knotted with the screw in rotation.

My daughter has chosen all the vices. In 2018 she was only 2 years old : Lol:

The wall is very healthy, observed for 4 years, no humidity. I also did this on ground floor walls facing north.
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Re: Attic insulation with recovery and recycling of plastics




by phil59 » 23/11/22, 15:56

To return to the subject, I would not do with plastic, on the ceiling, in the event of a fire, it is quickly a disaster!
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hmmmmm, hmmmmmmmmmmmmm, hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhmmmmmmmmm, huh, hmmmmmmmmmmmmm.

: Oops: : Cry: :( : Shock:


 


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