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Here are the first 2 photos of theimproved insulation in our attic that we are doing ...




The 3 hemp panels are 20 cm thick, there is a total of 2,07m². They are intended to be placed next to the attic hatch ...

The cellulose bag is given for 370L spread ...

Summary of the planned installation: isolate lost attics of 44m² with an R of 6 at least:

- 42 m² with 25 cm of loose cellulose
- 2 m² of hemp in 20 cm thick

Ah here is the exact cost (invoice):

a) 30 bags of 370L: 428.40 € or 11.1m3 or 38.59 € per m3
b) 3 hemp wool panels 20 cm: 72.43 € for 2,07 m² or 174.15 € per m3
c) Shipping and delivery: 86 €

TOTAL including tax: 586.83 for 44 m² approximately, i.e. 13.37 € per m² in R of 6,5!

Notes:

- insulating green with cellulose is not expensive!
- by taking 100% of cellulose we would have had a cost of 10.20 € for R of 6,6
- delivery (unfortunately not negotiable) is a significant additional cost of 15% ...

I just compared the costs with glass wool!

Hang on tight: glass wool is much more expensive with equivalent thermal resistance than cellulose.

A) So let's take an 100% cellulose insulation in our case: R of 6.6 for 42 m² for 428.40 € TTC either (I repeat): 428.40 / 42 = 10.20 € TTC per m² for R = 6.6 (26 cm)

B) According to leroy merlin catalog 291 page:



We read: 10,03 € / m² for an R of 3.10 either 21.35 € / m2 for an 6.6 R!

Glass wool is therefore 21.35 / 10.20 = 2.09 times more expensive than cellulose. In other words: glass wool is 109% more expensive than loose cellulose or cellulose is 53% cheaper than glass wool.

I am so amazed that I created a specific tioopic: Insulator prices: chemical glass wool more expensive than natural cellulose?

That's it, let's go! Photos and videos (Special Envoy Econologie.com ) will arrive as you go!

I have already handled hemp wool and make a "formwork" and good god it attacks the bronchi (I hadn't put on a dust mask) I didn't think it made wool as much dust ...

Christophe wrote:That's it, let's go! Photos and videos (Special Envoy Econologie.com ) will arrive as you go!

I have already handled hemp wool and make a "formwork" and good god it attacks the bronchi (I hadn't put on a dust mask) I didn't think it made wool as much dust ...

If you had read some comments on the subject (including mine), you would have put a mask and protections on arms and hands, because it scrapes well after laying (whether glass wool wool or hemp, I think it is kiff..kiff !!) Attention the lungs !!

For hemp wool, the Canadian specialist had said it not long ago.

Hello

because it scratches well after installation

Having posed it personally, in the form of a panel, I admit that we can be inconvenienced by the dust released during handling
Wool even has a slight odor if it is not sufficiently unwrapped and ventilated beforehand. I advise you to ventilate the wool well, even if it means "beating it like" for a carpet, before laying it
On the other hand, to assimilate the particles which fly easily with those emitted by the mineral wools is exaggerated
I think the size and the dangerousness are without comparison, and moreover there is no unpleasant feeling in contact with hemp wool.

A+

jean63 wrote:If you had read some comments on the subject (including mine), you would have put a mask and protections on arms and hands, because it scrapes well after laying (whether glass wool wool or hemp, I think it is kiff..kiff !!) Attention the lungs !!

What are you worried about? It was for info ... the glass wool thank you I knew (who does not know?) But for the hemp I thought it was not necessary ... That's all ...

jean63 wrote:For hemp wool, the Canadian specialist had said it not long ago.

Yes, but in "panels" I thought it was less dusty, but it's wrong ... I just mounted 2 m² that's all ...

Thank you for worrying about my lungs ... for cellulose do not worry I planned 2 masks!

loop wrote:On the other hand, to assimilate the particles which fly easily with those emitted by the mineral wools is exaggerated
I think the size and the dangerousness are without comparison, and moreover there is no unpleasant feeling in contact with hemp wool.

Well that's what I also thought ... that's why I didn't put on a mask ... but it isn't.

I also handled glass wool not long ago and the hemp seemed just as "dusty" to me ... see more ...

Now for the danger of particles I think there is no photo but a particle is harmful in itself by definition ...

For the smell it smells a bit like "sheep", right?

Here are the 1ere photos, after I go back :

The 11 m3 of cellulose in "bag" delivered this morning: we have 30 bags in all + the 3 hemp panels.



The "bare" roof spaces on the 2 "sides":




Bibi who still makes a few final joins: as in all attics of a certain age there were drafts in places! You will notice the look of my DIY skills (Christmas gift 2007) :)




"Formwork" for hemp panels: (top right, back to 1 inch of solar panels, will insulate it with foam this aprem too)



The formwork and hemp wool panels are used because it is obviously impossible to put cellulose on top of the hatch since it is the only access (or so those have a method it interests me! ).

Formwork in (almost) final position:



There is more than just pouring the cellulose everywhere around the formwork!

Ayé 50% has been achieved (15 bags)! Hard to "flocculate" by hand and with a rake and collect leaves ... but I found a great tip!

I'll explain later I go back, I finish before midnight!

It's quite awful given the dust that the "flocking" creates ... other than that it's quite pleasant to spread cellulose ...