Pumped cavity wall insulation is one of the most popular methods of wall insulation for new build constructions. The pump method offers great flexibility as any size cavity constructed can be filled ranging from 80mm to 300mm and more. All currently required U-values can easily be achieved.
Method of Installation:
When insulating the building, the operatives follow the NSAI and manufacturers drill pattern. This is to ensure that the cavities are fully filled. The holes are drilled into the cavity walls of the building from either inside or outside. These holes are approximately the size of a one euro coin (22mm). Silver Bead along with an adhesive is pumped under pressure into the cavity.
The Reality of Board Installation
On site imperfect conditions exist, leading to imperfect installation of the board, including:
Performance of Bonded Bead
Performance - BOARD
Thermal Looping and its Effect on U Value
Desk U Value of 150 Cavity Wall = 0.21
With 3mm gap: 0.54 FAIL
With 10mm gap: 0.65 FAIL
If cavity is not sealed to outside air, gap becomes ‘slightly ventilated’ and bypasses the insulation board entirely.
Overview - Bead is the Solution
Cavity wall insulation
Spray foam insulation
New build insulation
Dry lining / Internal insulation
Timber frame insulation
Heating system upgrades
Heating control upgrades
BER assessment & certification