38 percent of potential house purchasers would withdraw

38 percent of potential house purchasers would withdraw their offer on a house if it suffered from damp – YouGov
Over the last decade the rush to make our homes more energy efficient by installing cavity wall insulation. Now if the walls that protects this insulation allow it to get wet it temporarily loses it thermal resistance.
STORMDRY will prevent rain penetration, protects the bricks and pointing from frost damage.


As  the saying goes a stitch in time saves nine


If you have cavity wall insulation 


If you have cavity wall insulation it

temporarily loses its thermal resistance when it gets wet.

However you can protect it.

£200 off until 

31st July 2017

07961 428599

5% vat
Before & after treatment

What I noticed on a weekend walk

I live in a wonderful part of the world it’s on the south coast of England.  whilst out for a walk around  the suburbs I couldn’t help notice how many houses had cavity wall insulation retro fitted.

During the last decade or so different governments have encouraged home owners to save energy by insulating there  houses by offering grants that greatly reduced the cost . Many companies jumped  on this as an opportunity  to make a profit sending out an army of so called energy surveyor with little training. Paid on a commission only  bases and the guy that installed the insulation paid on price work so much per meter.

Now I believe we should not waste energy, however on my walk on Sunday I couldn’t help notice the poor quality of the brickwork of many of these insulated homes. Cavity walls main purpose is to keep your home dry if let say the pointing is warn and allows rain to  be driven into the cavity. The insulation can act as a spong soaking up the rain which can pass to the inside wall.

The outside and inside leafs of your walls are held together by a wall tie which is made of metal. If left sitting in wet insulation will rust in the first you might notice cracking in the mortor in the worst case  the leafs pulling apart.

One of my mothers favourite sayings is a Sitch in time saves 9, a coat water replent aplied now could prevent more costly work in the future. After 4 years a car in the uk has to have an mot maybe it’s a practice we should adopt for our homes.

Cavity wall insulation normally has a 25 year guarantee however when you read the small print most state that properties have to be maintained. 

Your home is probably the biggest asset look after your walls and they will look after you.

Andy Cavityexperts 07961 428599

How to protect cavity Wall insulation

Damp Cavity Wall Insulation
The Problem

Cavity walls were first introduced as a measure against water ingress in the 1890’s and slowly became the accepted norm over the next few decades. The outer leaf, which can be water permeable, acts to block, but will not always stop wind-driven rain from penetrating. A cavity behind the outer leaf allows any water that penetrates to drain down the cavity face of the outer leaf and pass safely to the outside.In the late 1970s, the need for energy conservation made the cavity a convenient location to place various types of insulation materials, commonly polystyrene beads, and mineral wool insulation. Now all new build cavity walls contain insulation and many millions of homes with walls that originally were built with empty cavities have had insulation retrofitted
Since the initial introduction of retrofit cavity wall insulation solutions have been developed and improved and the use of some materials has been restricted to areas of lower exposure to wind driven rain. Test regimes such as those required for BBA certification ensure that systems are able to resist the penetration of liquid water. In all exposure conditions through the insulation from the outer to inner leaf of masonry. Installation is completed by trained installers and in line with the system instructions. BBA Certificates exist for systems using mineral wool, polystyrene bead insulation and polyurethane foam.
 A condition of these certificates is that manufacturer’s instructions require an assessment of the condition of the outer leaf to be made and the cavity itself does not have significant debris or mortar projections and that the masonry, especially the pointing and mortar beds, are in a good state of repair at the time of installation. Most system are also guaranteed to prevent the passage of liquid water for a period of 25 years and this also requires that the masonry is kept in good condition.
That said problems of damp penetration can occasionally occur. Most commonly these pertain to the state of repair of the wall or the cavity debris has not been noticed. In these circumstances a heavy rain event could place stresses in terms of volumes and intensity of water on the insulation system that are beyond those tested for during certification and result in damp penetrating into the building’s interior causing condensation, mould growth and damage to decoration. Clearly in these circumstances reducing the amount of water penetrating the outer leaf will reduce the stress on the insulation system in the event of a similar rain event.

The mechanisms of rain penetration described in the diagrams below are more fully explained in BRE Report : Rain Penetration in Masonry Walls by A J Newman (1988)):

The Solution
The Where Cavity Wall Insulation has Already Been Applied

Applying Stormdry breathable waterproofing cream to the outer leaf will increase the walls water resistance, alongside the appropriate maintenance of the masonry mortar and pointing will significantly reduce the water penetrating the outer leaf and reduce the stress on the system. Stormdry breathable waterproofing cream will also allow any existing moisture evaporate through the masonry. In situations where cavity wall insulation has allowed damp to penetrate, this can provide a fast and less disruptive alternative to removing the insulation. Applying Stormdry will also serve to increase the energy saving performance of any existing insulation solution.a

Reduce Energy Bills by up to 29%

Keeps walls dry & warm

By creating a deep water-repellent zone on the masonry surface, Stormdry ensures that the masonry remains dry throughout the year. This maximises its thermal resistance, as dry walls are better insulators than wet walls. Testwork conducted by the University of Portsmouth using Stormdry suggests that energy saving of up to 29% are possible when Stormdry is applied to buildings of solid wall construct

For more information