You may or may not know if you have problems with external wall insulation on your home
Would you like us to check out your external wall insulation for possible defects and other problems, such as damp and condensation risk?
Many contractors ceased trading when the ECO, Green Deal finance and voucher scheme dried up, many homeowners have been left with defective wall insulation that can cause damp and damage the health of the occupants and the fabric of the building
Although we recommend and specify external wall insulation for most houses it is not suitable for all.
All4walls have always specified and offered a full range of external wall insulation systems in both modern materials such as K5 phenolic & EPS and also breathable cork and wood wool systems using lime renders which have excellent breathability features, each specification is made to work with the home it is going to wrap up.
Some of our systems are incorporated together using a combination of materials, some modern some more suited to historic buildings, Systems can be designed using materials such as K 5 boards above 1000mm level and cork below which is breathable, they provide a hybrid system compatible with moisture levels in certain houses.
If you have solid wall insulation problems such as damp, mould, render failure or just shoddy workmanship you may be able to claim for the work to be put right by All4Walls through a guarantee you do not even know you have such as the Solid wall insulation guarantee agency ( SWIGA) or you may have some help in finding out any other guarantees issued for your exterior solid wall insulation through OFGEM
All4Walls have had many years of experience in the solid wall insulation trade, long before the birth of the green deal initiative. As well as solid wall insulation installers and surveying experts we are also qualified Green Deal and Domestic energy assessors. If needed we are also able to utilise the services of qualified Royal Institution of chartered surveyors (RICS) to help with your project.
The main early failure and problems with external wall insulation are usually caused by water ingress
Most external wall insulated renders terminate and finish under the roofline by use of an Aluminium 90° Profile (L shaped) The insulation slab and the render finish sit under this horizontal tray and it prevents water from entering behind it and into the insulation
With sufficient roof overhang, sitting under and protected by the protruding eaves this detail does not usually provide any potential problems.
However, many contractors working under the GREEN DEAL or ECO initiative were on a very tight budget.
This end tray or verge tray details as is it also known was often fixed in place and exposed, protruding beyond the roof line and only sealed with a bead of mastic.
Even high-performance mastics have a limited longevity
During winter months piles of snow and ice can gather on this horizontal piece of metal profile which also has to cope with copious amounts of rain, over time it is likely that the mastic joint will fail, which could allow water penetration between the insulation material and the original wall. With many insulation slabs such as EPS polystyrene being waterproof any damp has only one direction in which it can go and that is internal, with damp entering and getting trapped within the home.
Other water entry points can be around electricity meter service boxes, overflow pipes, mains electric cables etc.
Many very old solid wall properties are experiencing vapour permeability damp issues. Houses that do not have damp courses or membranes have a higher moisture content. Subsequently, many of these houses cladded with non-permeable materials such as polystyrene or XPS insulation slabs are experiencing damp problems.
Very thick solid walls built on the ground with no damp course detail rely on a level of moisture exchange to keep the walls and the inside of the home dry. This is the ability for damp within the wall, particularly at the bottom 1000mm or three-foot level to escape through the building material, also moisture on the outside of the wall dries off and escapes. Most installed external wall insulation systems completely stop this moisture escape from happening.
Some houses are already suffering from damp issues directly caused by or exacerbated by having external solid wall insulation fitted.
Without adequate vapour exchange, some insulation material used for external wall insulation completely stop house walls from breathing.
This can lead to a raised moisture content inside the home triggering condensation which can spawn mould and cause serious respiratory problems this all leads to an unhealthy living environment for all occupants.
If you would like All4Walls to carry out a survey report for any possible defects with costs to put them right please contact us for more information and a quotation.