25-British Gypsum Plaster, Plasterboard and Drylining Systems News 270607

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British Gypsum - Guidance on: Water damage to walls and ceilings

Recent flooding has again highlighted the issue of water-damage to homes and business premises. Plasterboard and plaster manufacturer, British Gypsum, has issued the following general advice:
“The effect of water damage to either masonry or timber/metal stud structures will depend on the extent and severity of the wetting, and will generally be difficult to assess. With all but the most superficial of damage, it is advisable to arrange for a professional survey to be carried out to assess the extent of the damage and advise on possible remedial action, prior to carrying out any work.
The following recommendations should be noted when treating water damaged walls and ceilings:
Plasterboard walls and ceilings
Any plasterboard (other than special moisture-resistant grade) that has been subjected to water,particularly where ‘bowing’, mould growth or delamination of the surface paper has occurred, should generally be removed and replaced with an equivalent Gyproc product to maintain the original performance.
In some instances of only superficial or surface wetting, it is possible that the board may dry out to its original specification, although water staining or mould growth may occur at a later stage. It is recommended that professional advice is sought before treating any area where mould growth is present.
In the case of cavity stud walls or suspended ceilings, the cavity should be inspected, and consideration given to possible mould growth problems. Metal components and accessories used in wall and ceiling construction are generally galvanised to a recognised British Standard to prevent rusting, although areas of cut or drilled metal should be inspected for rust if prolonged exposure has occurred.
Due to its water repellent qualities, Isowool Insulation installed within the cavity will generally retain its properties when it has dried out, provided that it has retained its form.
In all cases, the cavity and its components must be allowed to dry out thoroughly before re-boarding.
Plastered walls
British Gypsum generally recommends that any gypsum plaster that has been affected is removed and replaced with an appropriate Thistle plaster product in order to maintain the original performance.
Where mould growth is present, or where backgrounds have been extensively wetted and contain salts which may contaminate new plaster, professional advice should be sought and any necessary remedial treatment carried out prior to replastering.
Where only the finish coat plaster has been affected, it may be possible to re-finish as necessary with an appropriate Thistle finish coat plaster, although treated areas could still be affected by staining, salt contamination or mould growth, which may require further remedial treatment.

Email: paul.smith@bpb.com