As demand for modular and high-rise construction accelerates,  getting the building envelope right is more important than ever.  Proshield®, a vapour-permeable, self-adhesive membrane from  Don & Low, meets that challenge head-on.

DESIGNERS AND CONTRACTORS require solutions that strike a balance  between performance and practicality,  delivering airtightness, moisture control,  and fire protection without compromising  installation speed.

Smart sealing for modern methods 

ProshieldR is a fully self-adhesive, vapourpermeable  membrane engineered for the  demands of offsite and high-rise construction.  Its three-layer structure (270g/sq m),  comprising a robust air barrier, adhesive  coating, and transparent silicone-coated PET  release liner, offers high damage resistance  and easy installation. Unlike traditional  membranes that require primers, tapes, or  mechanical fixings, ProshieldR bonds directly  to a range of substrates, including OSB, steel,  concrete, timber, gypsum board, aluminium,  and wood. Whether applied in the factory or  on-site, it forms a continuous, fully bonded,  airtight layer across walls, floors, and roofs.

Designed to save time on-site 

Time is critical in modular construction.  Products that reduce sequencing steps  bring significant gains. ProshieldR requires  no primers or extra sealing products. Its  peel-and-stick application speeds up sealing,  streamlining production and enabling rapid  weatherproofing on-site. By placing the  air barrier externally, ProshieldR simplifies  detailing. The membrane serves as both an  airtight layer and secondary weather barrier,  helping projects reach wind and watertight  stages sooner – supporting faster build  programmes and handovers.

Built to withstand the real world 

Factory-built modules are often exposed to  the elements during transit and installation.  ProshieldR is made to perform under  pressure, achieving Class W1 water resistance  (EN 13859-1) and withstanding over a metre of  water. For fire safety, it achieves Class B-s1,d0  (BS EN 13501-1) when adhered to appropriate  substrates* (*Class B-s1,d0 fire rating applies  to installation over calcium silicate or fibre  cement board. Other substrates may vary)  meeting the needs of modular and high-rise  construction. With low vapour resistance,  ProshieldR maintains airtightness while  allowing trapped moisture to escape,  reducing risks of condensation, mould,  and structural damage.

Practical details that make a difference 

The ProshieldR bright blue colour aids  visibility on-site, while its printed grid helps  ensure accurate alignment. Don & Low  also supplies a complete set of matching  accessories, including tapes in various widths  and preformed corners, ideal for sealing  windows, doors, and external junctions.

Quality you can specify with  confidence 

Manufactured in the UK by Don & Low – the  UK’s only vertically integrated membrane  producer – ProshieldR ensures consistent  quality and responsive supply. It contains  at least 20% recycled content and will be  supported by an environmental product  declaration (EPD), offering independently  verified lifecycle impact data. BBA  certification is underway, reinforcing its  reliability in modern specification.

Every roll of Proshield® is backed by Don &  Low’s in-house technical support, offered free  of charge. From build-up detailing and product  selection to installation guidance, their expert  team ensures airtightness is achieved as  designed. Find out more at: www.donlow.co.uk