HEAVYSIDE Pitch perfect

With low pitch roofing products continuing to be in high demand, Marley has launched a new concrete interlocking tile, which can be used down to a minimum pitch of just 12.5 degrees. The new Mendip 12.5 has the same double pan design as the original concrete tile, but includes some innovative features to ensure it can be used at a lower pitch. Designed with single storey extension projects in mind, the Mendip 12.5 has four weatherproofing channels at the face of the tile to prevent water ingress from wind driven rain. To make it even more watertight, the tile has no nail hole and is instead installed with its own Mendip clip. As well as the original Mendip

tile, which can be used down to pitches of 15 degrees, the range now features the Mendip 12.5 in two colours - Smooth Grey and Smooth Brown - giving contractors more choice on low pitch projects. Single storey extension projects often require a lower pitch roof due to the position of first floor windows. Standard tiles aren’t always suitable because weather tightness decreases as the roof pitch gets lower and it takes longer for water to drain from the roof. However, Mendip 12.5 has been designed with discreet features to channel away wind driven rain and keep it watertight, so it is guaranteed to perform at much lower pitches.

The Mendip 12.5 is installed


Safeguard Europe’s Dryzone high- performance plasters collection is a range of breathable modern plasters designed to stop salt migration and aid drying on damp walls. All four variants in the plaster range have been scientifically developed and tested to provide excellent resistance to hygroscopic salts whilst providing a highly breathable surface.

The pre-blended plasters – Dryzone Damp-Resistant Plaster, Fast-Set Plaster and Hi-Lime Renovation and Hi-Lime Finishing Plaster – form part of the Dryzone System for replastering after Dryzone Damp-Proofing Cream or Dryrod Damp-Proofing Rods have been used to create a remedial damp proof course. The plasters are ideal for replacing 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. They are also suitable for use in other situations where residual damp will be

present, such as after treatment for penetrating damp or as part of a flood repair project.

Safeguard renovation plasters can be applied to walls while they are still damp and, by controlling salt migration and allowing walls to dry out by evaporation, the walls achieve a higher thermal resistance, reducing the risk of future condensation.

Dryzone Fast-Set Plaster, which cures in around two hours, is suitable where speed of application is crucial. It is also ideal for smaller areas, repairs and dubbing out uneven walls.

Dryzone Damp-Resistant Plaster has a porous structure which controls salt migration, allows walls to dry out by evaporation. It is especially suited for use on highly salt and damp contaminated walls. The Hi-Lime Renovation

Plaster and Hi-Lime Finishing Plaster are especially suitable in heritage situations where rising or penetrating damp means pure lime plasters can start to fail and are not as breathable.

Tests have shown the hi- lime plasters allow up to 40% more water transmission than a traditional mix of 3:1 sand and lime and up to 240% more than 3:1 sand and cement over a 14-day period. Dryzone Damp-Resistant Plaster and Dryzone Fast-Set Plaster have been shown, also over two weeks, to diffuse over 80% and 70% more water vapour than 3:1 sand and lime, respectively too. Other properties include a low compressive strength, ensuring that the plaster can easily be removed later without damaging underlying brickwork.

with a head clip and it is also compatible with the speedy SoloFix one-piece clip and nail, which can be used as the second clip in accordance with BS 5534. When installing to a low pitch of 12.5 degrees, it has a maximum 100mm head lap and can be used at six metre rafter lengths only. The new tile also has strong sustainability credentials, including an A+ rating in the BRE Green Guide to Specification and an ‘Excellent’ BES 6001 Responsible Sourcing Certification.

BMI provides watershed moment for primary school

Cost-effective and guaranteed for 20 years, the bespoke solution devised by BMI UK & Ireland and contractor Watershed Roofing gave a Yorkshire primary school roof a new lease of life and solved its ponding problems. The school roof had large areas of ponding water that had arisen as a result of its prefabricated design which used CLASP componentry, a prefabricated, light-gauge, steel building system common in the late 1950s and 1960s.

These original buildings had been extended several times without due consideration for the roof and its drainage. For example, the prefabricated units were supplied with internal drainage on the assumption that they would be separate buildings, and this was still in place – sometimes just covered with boarding, despite the units being part of a complete school complex.

Watershed and BMI determined that stripping out the existing roof would be complex and unnecessary as an alternative less invasive system that offered better value for the academy was identified. The refurbishment roof specification included utilisation of the existing system as the substrate, with the subsequent application of the BMI Thermaweld FireSmart warm roof system, incorporating a new cut-to- falls insulation scheme. November 2020

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