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Curing Aggressive Damp Penetration Externally at Primary School in South Wales
by Newton Waterproofing Systems
The Alltwen Primary School in Pontardawe, Swansea is located in a extremely exposed area resulting in driving and penetrating dampness hitting the outer fabric of the building and spoiling the internal render and finish to the classrooms. 

The Neath and Port Talbot District Council specified the external application of Newton's Newlath 2000 to eradicate this problem as it had been used successfully on other school projects where the same problem existed. The membrane could not be applied internally because of the disruption it would cause to teachers and pupils.
  The membrane was applied with skill and competence as the project required intricate detailing in particular to the window coins.  The fixing centres were generally spaced at 200mm but reduced to 100-150mm in the demanding areas. A 6:1:1 clean sharp sand, cement, lime mix was then applied in two coats to the membrane with a rubbed float finish in preparation for decoration. 

The contract was in excess of 250 square meters and the local authority were delighted that the project came within their budget and was completed ahead of schedule using the externally applied technique. 

The existing substrate which was constantly saturated is now in the process of drying out aided by the 5mm air gap created by the Newlath 2000. In addition any further attempts of moisture entering the building fabric is repelled by the membrane. Great U values are now being achieved with the membrane warming the interior of the school and no expensive re-pointing was required.
This case study has been submitted by a member and the British Structural Waterproofing Association accepts no responsibility for its content. 

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