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

The vapour barrier is dressed up the wall a minimum 400 mm. The Bauder Insulation Upstand Support Bracket is fixed to the wall using suitable fixings with its top edge a minimum 300 mm above the deck. 30 mm thick insulation is applied to the upstand, held in place by the support bracket. The insulation is applied to the flat area of the roof, and the underlayer taken over the bracket to lap with the vapour barrier by 100 mm. The capsheet is applied, with a separate flashing to the upstand. 38 bauder. ie ANCILLARY PRODUCTS ADDITIONAL BAUDER PRODUCTS Bauder R333 Taping Strip Bauder R333 taping strip is used to tape over the joints in certain types of decking ( plywood, woodwool slabs, etc.) before laying the vapour barrier ( or underlayer in the case of a cold roof). The purpose of this product is to take up any movement between adjacent structural panels, whilst also preventing molten bitumen from running through the joints. It can be held in place with staples, dabs of bitumen, bitumen adhesive or self- adhesive tape. Bauder TA600 This product is a polyester based membrane used as a sacrificial random nailed layer for application of Bauder RBM systems to timber boarded decks ( close butted or T& G). The material should be random nailed ( using large headed galvanised clout nails) at 200 mm centres, with 50 mm stagger nailing to all perimeters, head and side laps, prior to installing the next layer which should be fully bonded. Bauder TA600 Random Nailing Pattern 200 mm centres in field area 50 mm stagger nailed at perimeters and laps Insulated Upstand Support Brackets Part L of the Building Regulations for England and Wales requires all perimeters and details of a flat roof system to be designed and created in such a way that thermal bridging is reduced, and heat loss consequently minimised, in order to help reduce carbon dioxide emissions. This regulation applies to both New Build and Refurbishment work and reference is made to ' Accredited Construction Details' design guidance. This document shows that all buildings with warm roofs and insulated walls should have insulation applied to the inside face of the wall at roof level to a minimum height of 300 mm above the deck. This is to reduce cold bridging through the inner skin of brickwork. In order to make this detail both technically and simply achievable, Bauder have developed a unique support bracket for use with our bitumen systems. The installation sequence is shown in the series of pictures below.