Super-insulating Aerogel plaster – Fixit 222

Product overview

Where is it used?

• Fixit 222 aerogel insulating lime plaster can be used internally or externally on masonry walls.
• It can be used on of all types of modern and historic masonry but is ideal for use in stone or brick buildings where vapour permeability is important.
• It should not be used at plinth level on the exterior.
• Can be used in basements.

How is it used?

• This product is for purchase and installation by trained installers only.
• First, the surface of the walling may require preparation with a spatterdash coat to ensure a good key.
• A stainless steel mesh may be fixed and stood off the wall if it is very uneven to ensure good adhesion and levelling of the surface and allows render application over timbers.
• Fixit 222 is then machine applied (sprayed) at a minimum of 30mm or up to 150mm in one coat.
• The aerogel plaster should then be left for a minimum of 21 days, up to 35 days to cure, during which time it should be wetted regularly during dry and warm weather.
• Once cured, the surface can be scraped to give a texture for subsequent coatings.
• A coat of Fixit 493 silicate primer should be applied to the surface and left for 24 hours to cure.
• After curing a 5mm coat of Fixit 223 contact mortar with fibreglass mesh should be applied before any finish coats.
• The surface will then take any type of internal or external lime finish coat plaster.

How much will you need?

Fixit 222 aerogel insulating lime plaster has a density of 0.2kg per mm per m² (1mm thickness of plaster over 1m²). Each 10kg bag (50 litres) of will cover up to 1.6m² at 30mm thickness or 1m² at 50mm thickness.

Here you can see what thickness of plaster is required for a given U-value on a common solid brick wall. Solid stone masonry will give a similar overall performance.