SITE BOOK - Plaster systems - British Gypsum
SITE BOOK - Plaster systems - British Gypsum SITE BOOK - Plaster systems - British Gypsum
Technical support: T 0844 800 1991 F 0844 561 8816 E bgtechnical.enquiries@bpb.comInstallationPlaster systems11MixingUndercoat plasters are pre-mixed withaggregate. Add only clean water toprepare them for use.• Mix by hand or mechanical whisk (avoidexcessive mechanical mixing).• Use only clean water and clean mixingequipment.Contamination from previousmixes can shorten the setting time andreduce the strength of the plaster whenset.• Use plaster projection machines whereappropriate.Thistle Hardwall, Thistle ToughCoat and Thistle Universal One Coatplasters can be mixed / applied usingplaster projection machines.Solid backgrounds• Apply undercoat plaster with firmpressure.• Build out to the required thickness insuccessive coats of approx. 8mm.• Wire scratch each coat and allow to setbefore applying the next.• Rule the final coat to an even surfaceand lightly scratch to form a key for ThistleMulti-Finish or Thistle Durafinish.9423
www.british-gypsum.comPlaster systems19• Thistle Durafinish requires ThistleGypPrime to reduce the suction. A mix of5 parts water to 1 part Thistle GypPrimeshould be applied to the undercoat plasterand left to fully dry prior to the applicationof Thistle Durafinish.The maximum thickness ofundercoat is 25mm. Greater thicknessnormally requires the use of a supportfor the plaster (e.g. metal lathing),spaced away from the background ifnecessary.Backgrounds following dpc treatmentThistle Dri-Coat is the only British Gypsumplaster recommended for this application.• Allow initial curing and shrinkage of thescratched undercoat to take place prior toapplication of finish plaster.In good drying conditions, aminimum delay of 24 hours is required.In cold / damp conditions or wherebackground suction is low, a longerdelay will be necessary. If sufficient delayis not allowed, cracking or shelling ofthe finish coat may result.• Where the floor is solid, leave a 50mmgap between the plasterwork and thefloor level. Under no circumstancesshould the damp proof course be bridged.424
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www.british-gypsum.com<strong>Plaster</strong> <strong>systems</strong>19• Thistle Durafinish requires ThistleGypPrime to reduce the suction. A mix of5 parts water to 1 part Thistle GypPrimeshould be applied to the undercoat plasterand left to fully dry prior to the applicationof Thistle Durafinish.The maximum thickness ofundercoat is 25mm. Greater thicknessnormally requires the use of a supportfor the plaster (e.g. metal lathing),spaced away from the background ifnecessary.Backgrounds following dpc treatmentThistle Dri-Coat is the only <strong>British</strong> <strong>Gypsum</strong>plaster recommended for this application.• Allow initial curing and shrinkage of thescratched undercoat to take place prior toapplication of finish plaster.In good drying conditions, aminimum delay of 24 hours is required.In cold / damp conditions or wherebackground suction is low, a longerdelay will be necessary. If sufficient delayis not allowed, cracking or shelling ofthe finish coat may result.• Where the floor is solid, leave a 50mmgap between the plasterwork and thefloor level. Under no circumstancesshould the damp proof course be bridged.424
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