Mineral Insulation Board – Xella Multipor

Product overview

Where is it used?

• Multipor boards can be used anywhere fire resistance is required, both internally or externally on masonry walls, including high rise residential buildings.
• 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.
• Multipor ExSal Therm boards can be used to line basement walls, even in moist conditions.
• Multipor boards will also insulate masonry ceilings, concrete roof decks and plinth areas.

How is it used?

• For internal above ground use, the wall surfaces are cleared of loose plaster, gypsum plaster, paint and wall paper and levelled using Baumit KZP 65, if required.
• The back of the boards are coated with a 5mm layer of Fix X710 adhesive and bonded directly to the walls.
• Once the boards are installed the surface is then plastered with a mesh coat of Fix X710 and left to cure.
• If the surface is to be tiled, 4 fixings per m2 will be required to go through the mesh and into the masonry wall behind whilst the plaster is wet. The maximum weight of the tiles should be 25kg/m2.
• Once cured, the plastered surface will take any type of lime finish coat plaster.
• See the video below as a simple guide or download the full instructions in the downloads section below.

How much will you need?

• Each Multipor board is 600 x 390mm and covers 0.234 m2 so you’d need around 4.5 blocks per m2, including waste.
• Below are the likely U-values that each thickness of board will achieve on a common solid brick wall. Solid stone masonry will give a similar overall performance.