R&R 8954 52 Nov '15 cc

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Damp & Condensation | Getting plastered! Hudson Lambert, director of Safeguard Europe, looks at the alternatives to traditional plasters when seeking to re-cover damp walls. Traditional plasters have been used on internal walls for thousands of years to create smooth, decorative surfaces. For instance, lime-based plasters were being used in Jordan as long ago as 7500 BC; while clay and gypsum plasters were used in ancient China and India. www.safeguardeurope.com/products/dryzone In the UK, lime plaster – either applied directly to walls or onto timber laths – was used until the middle of the 19th century, until ceding a dominant position to gypsum plasters and then, since WW2, gypsum plasterboards. These are all quality systems and quite durable when applied to dry walls. However, in the face of rising or penetrating damp, gypsum boards and lime or gypsum plasters can start to fail. This is especially the case where the dampness introduces salts into the plasterwork. Consequently, there is a need for internal plastering systems that are impervious to this sort of damp damage. Previously, the solution would have been sand: cement plasters, based on strong mixes (typically 3:1), of sharp sand and cement and often with a waterproofing additive incorporated. There is no doubt that these are very effective at holding back damp and salts, yet have from their own downsides such as condensation risk, poor insulation qualities and a cold feel that is unpopular with building occupants. Also slow and expensive to apply, they are not suitable for traditional buildings (because they can’t flex), don’t breathe and can damage underlying brickwork. Alternatives were seen in the first generation of refurbishment plasters, typically composed of cement, lime, perlite, and calcium stearate; yet their resistance against damp and salts was relatively poor compared with sand: cement versions. More recently, new ‘second generation’ plastering systems were introduced that are more resilient to dampness and salts than traditional plastering methods. These are intended to replace existing plaster that has already deteriorated (having already also tackled the cause of the damp); or for use in new-build and conversion projects to limit potential damage caused by minor ingress of dampness during the lifetime of the building. These modern replastering systems are capable of being applied to walls while they are still damp and can resist high levels of moisture and salt ingress. The suitability of these for a given project will depend on a number of factors such as the age of the building, the required speed of application, and whether or not is possible to fully deal with the underlying cause of dampness. The make up of these plasters means they have large pores and a high pore volume. This allows salts to form within the plaster rather than on the surface; and the high pore volume results in higher thermal resistance, reducing the risk of condensation. Other properties include a low compressive strength , ensuring that the plaster can easily be removed at a later date without damaging underlying brickwork; high water vapour diffusion (breathable) and conformity for the EN998-1 CE Standard as ‘Renovation Mortars’. :Dryzone renovation plaster (left) vs Gypsum (right) in a salt bath test. The gypsum lost comprehensively. 16 refurb| RENEW November2O15 issue 8954
Give the cold shoulder to unhealthy air in your home It’s a bit of a chilling thou ught, but did you know that the air in a house cou uld be more polluted than the air in your street t outside? And the bleak truth is that t there e are clear sympt oms of a toxic home, including:- Condensation Headaches and fatigue Mould Coughing and sneezing Breathin ng problems So if you only do one thing this winter to give impure air the cold shoulder, make sure it’s to contact Johnson & Starley for a healthier home solution. A healthy home is a Johnson & Starley home. Facts 90 % of our time is spent indoors* 91 % of homes had above the approved levels of indoor pollutants.* *sourc ce: BEAMA, of 122 homes surveyed Call us to see which solution is right for your customers. 01604 762881 www.johnsonands tarley.co.uk
Page 1 and 2: November / December 2O15 issue 8954
Page 3 and 4: Dear Reader Completing the final ed
Page 5 and 6: News | The survey of 1,005 Londoner
Page 7 and 8: Always moving forward Our two most
Page 9 and 10: www.mapei.co.uk Refurbishment and M
Page 11 and 12: EAGIT training centre and an additi
Page 13 and 14: www.handrailsuk.co.uk E ma il: sale
Page 15: : London residential building inter
Page 20 and 21: Damp & Condensation | Waterproofing
Page 22 and 23: Floors, Walls & Ceilings | Sika com
Page 24 and 25: Floors, Walls & Ceilings | Make sup
Page 26 and 27: EW 313 EW 210 EW 112 EW 012 EW 312
Page 28 and 29: 28 Roofing, Cladding & Insulation |
Page 30 and 31: Roofing, Cladding & Insulation | Fi
Page 32 and 33: Roofing, Cladding & Insulation| Get
Page 34 and 35: Roofing, Cladding & Insulation | Re
Page 36 and 37: Roofing, Cladding & Insulation | Wh
Page 38 and 39: 38 Roofing, Cladding & Insulation |
Page 40 and 41: Building Automation | JCC’s new i
Page 42 and 43: Building Automation | CE Marked? Ch
Page 44 and 45: Doors & Windows | Protecting people
Page 46 and 47: Doors & Windows | Relcross are auto
Page 48 and 49: Washrooms & Kitchens | Changing pla
Page 50 and 51: Washrooms & Kitchens | Smith’s Sp
Page 52: 20 YEARS OF EXPERIENCE IN HIGH EFFI

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