36 bauder. ie INSULATION APPLICATION METHODS There are 3 methods of bonding insulation that can be used depending on the system specified: Hot bitumen This is the most traditional and still the most common way to bond insulation in bituminous warm roof systems. Grade 95/ 25 bitumen should be used at a temperature of 220- 230° C, poured onto the vapour barrier from a watering can. This is the standard product used in BTRS and Bauderflex systems as it provides a thick, self levelling bed to which the insulation can be applied, with time to move the boards into position before a strong bond is achieved. This product requires the use of a heating pot and therefore a degree of risk to Health and Safety. It is therefore slowly being replaced by alternative products and methods of installation. Bauder Insulation Adhesive This is a foaming polyurethane adhesive, which is poured onto the vapour barrier directly from the tin. It is applied in 8- 10 mm wide continuous strips approximately 200 mm apart, so that each insulation board is set into 3No. rows of adhesive. At perimeters the adhesive is increased to 4No. rows per board to ensure effective resistance to wind uplift. The adhesive takes longer to set than hot bitumen, and this needs to be allowed for by the installer. Factory Applied Bitumen Adhesive Bauder DS1 DUO vapour barrier has strips of bitumen adhesive factory bonded to its uppermost surface, covered with a thin polyethylene film to prevent it sticking to itself inside the roll. Once the product is installed, the surface can be heated with the flame of the gas torch causing the polythene to disappear and the adhesive to become activated. The insulation is then placed into position immediately, and a strong bond is achieved instantly. Cold Roof Specifications The membranes should be laid in the direction of slope, working up the slope. The head of the capping sheet must be mechanically fixed through to the deck using 5 fixings at 200 mm centres. The fixings must be large headed galvanised clout nails or screw fixings incorporating load spreading washers, suitable for the substrate to which they are being fixed. The fixings will be covered within the head lap joint by the tail of the following sheet. Warm Roof Specifications In a warm roof situation it will be necessary to securely fix timber battens across the roof at 90° to the direction of the slope ( before installing the vapour barrier) in order to provide mechanical fixing points for the capping sheet head laps. The battens should be the same depth as the insulation thickness and at least 50 mm wide. The membranes should be laid in the direction of slope, working up the slope. The head of the capping sheet must be mechanically fixed using large headed galvanised clout nails through to the timber battens using fixings at 75 mm centres in 2 rows with 50 mm between rows. The fixings will be covered within the head lap joint by the tail of the following sheet. Sectional Diagram showing layout of capping sheet ( for systems that utilise 5m long capsheets), fixings and fixing battens on roofs between 5° and 60° pitch. Decking, vapour barrier, insulation and underlayer not shown for clarity. SLOPING ROOFS ( OVER 5 ° ) Fixing Battens 2 rows of fixings Capping Sheet 4.9m Batten Centres 100 mm 50 mm 50 mm 5.0 M 25 mm

Welted Drips This traditional method of terminating the membranes at the roof edge, whether at a kerb or external gutter, remains a favourite. These can be with or without a hardboard or plywood former, depending on the preference of the installer ( although a former must be used for System Airtech). The method of creating a welted drip is detailed in Codes of Practice BS8217: 2005 and shown on many Bauder detail drawings. GRP Edge Trims A more aesthetically pleasing alternative to a welted drip at the edge kerb is a GRP trim. Bauder can supply these in black, white or grey as standard. We advise against the use of metal trims ( particularly aluminium) as these have been a common cause of problems in past years - their high rate of expansion and contraction causing splits to traditional felt membranes and asphalt on the top of the kerb directly above trim joints. Timber Protection Plates These are to be provided against the exposed edges of insulation to prevent mechanical damage ( gutter edges, drip edges etc.). The use of a batten or timber plate will depend upon the actual situation. A 150 mm timber plate should be used where water drains off or over the detail and the thickness of the waterproofing build- up must be accommodated to avoid the creation of a water check. The plate must be at least 15 mm less than the thickness of the insulation. 37 bauder. co. uk DETAILING APPLICATION GENERAL DETAILING Vapour Barrier / Underlayer Seal At all perimeters and details it is extremely important that the vapour barrier is taken up the detail to lap with the underlayer by a minimum 100 mm. This applies to all Bauder RBM systems, and is important to is give security to the system during high winds. This practicealso ensures that any water penetrating system will not contaminate the insulation as it is totally encapsulated. Protection at System Termination Protection must be provided at all vulnerable edges of the system to prevent water ingress behind. This may be a metal coverflashing or a cladding system in the case of an upstand to a wall, or a welded collar around a plant support leg. Bauder will provide a range of standard drawings showing preferred solutions to common problems on request. Angle Fillets At all 90° internal bends, at horizontal / vertical interfaces, Bauder angle fillets must be provided above the insulation, in order to soften the angle and make it easier to seal where the membrane laps occur at the interface. In a cold roof design, timber fillets should be used prior to installing the waterproofing membranes. Small protrusions through the roof need not have angle fillets installed around them, but extra care must be taken by the installer to achieve a good seal. Separate Flashings The capping sheet should never be taken across the roof and up a detail in one piece. The polyester within the capping sheet may shrink over time causing ripples and de- bonding of the membrane. All Bauder details show separate capping sheet flashings to counteract this. Insulation 150 mm treated timber plate - 15 mm less thickness than the insulation board TECHNICAL GUIDE