Got a conversion to do? Building project? Got questions? Need Answers? Offering a product or service? Visit our forum...

My Barn Conversion

Login

canadian pharmacy
About | Shop | Privacy | Forum | Gallery | Contact Us

Insulation ~ Polyurethane

Category: insulation February 16th, 2009 by mbc

Often abbreviated to PU, Polyurethane is usually applied as a foam insulation sprayed onto the underside of roof rafters.

insulation

Description
A complex manufactured compound, polyurethane has traditionally been manufactured from petrochemicals and so has a few green credentials except for those gained from the energy it saves. Recent developments toward the use of polyols derived from vegetable oils to make polyurethane may yet redress this and shift this technology toward the green part of the insulation rainbow.

Features

  • Manufactured from petrochemicals so not sustainable and toxic when burnt.
  • High embodied energy.
  • Low k-value.
  • Moisture & fire resistant.
  • Adds structural stability to a roof, seals small gaps etc. – Can be a viable alternative to a complete re-roof.

Lies, damn lies & statistics…
Don’t agree? Know better? Got a real world example to share? Are you a manufacturer or supplier with something to say?
This isn’t a one way street, we really want to hear from you so please comment below or have your say on the forum
Great posts will be eligible from prizes from our forum competition!

Performance
Polyurethane has a thermal conductivity or K value of 0.02 W/m.K.
(Watts per meter Kelvin ~ a lower value is a better result)

Cost
Per meter costs are difficult to derive as Polyurethane is usually supplied as an all-in service including installation. Typically, it will cost 4 to 5 times more than mainstream alternatives such as mineral wool with a total cost of £2-3,000 for an average UK home.

Reference:
For the science see the very thorough Wikipedia article: http://en.wikipedia.org/wiki/Polyurethane

If you enjoyed that post, then read these…

Insulation ~ Wood Fibreboard
Made from pulped wood, wood fibreboard is potentially a local material for all.

tag: ‘insulation

Insulation ~ Extruded Polystyrene
Extruded Polystyrene (XPS) is made by mixing polystyrene and a blowing agent under pressure and then forcing the resultant fluid through a die.

tag: ‘insulation

In my absence…
In my absence the quality of the advice on this site has certainly improved.

tag: ‘insulation

Posted in insulation | 1 Comment » « Leave Yours
Tags:

One Response

  1. Insulation ~ Polyisocyanurate | my barn conversion Says:

    […] Insulation ~ Polyurethane […]

Leave a Comment

Please note: Comment moderation is enabled and may delay your comment. There is no need to resubmit your comment.