EWI to top of monopitch verge [Version ID #210]

Author details

Original Author:Admin Organisation:

Detail summary

EWI detail for insulation running up to the top of an existing monopitch verge and forming a new parapet with stainless steel cap flashing. New lead flashing to junction of roof with insulation and stainless steel cap flashing over insulation and render.

Technical description

Section detail. EWI to monopitch verge to form parapet. New flashing and capping over EWI.

REFERENCE SPECIFICATION:

New flashing and membrane to BS EN 10088-2 and BS EN ISO 9445-1 or -2. with sealant to flashing to BS EN ISO 11600. Reference should be made to Approved Document H (drainage and waste disposal)

Care should be taken to ensure air-tightness. Seal all service penetrations through EWI and existing wall. Lap and tape all membranes around edges of EWI system. All insulation to be continuous to avoid thermal bridging.

Preparation of external wall: Remove any existing loose material and prepare in accordance with manufacturer's requirements. Any alterations to drainage and other fixtures, or work to prepare the substrate, to be agreed with contract administrator prior to work being undertaken. Prior to start on site inspect the form and condition of the structural substrate; institute repairs and/ or additional works necessary to make the substrate suitable to receive EWI system.

Rolled lead sheet to BS EN 12588. Tolerance (by weight): ±5%. Colour marked for thickness. Soakers and step flashings (slate or tile roofs): Length: Slate/tile gauge + lap + 25mm. Upstand: 75mm (min), underlap: 100mm (min). \ Lead step flashings: length: 1500mm (max), end to end joint: laps 100mm (min). Overlap to soaker upstands 65mm (min) cover. Lead wedges at every course.

Step and cover flashings (single lap tile roofs) in sheltered/ moderate exposure locations. Length: 1500mm (max), end to end joint: laps 100mm (min). Overlap to soaker upstands 85mm (min) cover. Lead wedges at every course. Clipped at 500mm (max) centres along free edge.

Single step and cover flashings (single lap tile roofs) in exposed locations. End to end joint: laps 50mm (min). Overlap to soaker upstands 65mm (min) cover. Lead wedges at every course. Length: 1500mm (max), end to end joint: laps 100mm (min). Overlap to soaker upstands 85mm (min). Cover to roof: 150mm (min) and over first tile corrugation. Fixing: turned over head of tiles. Clipped at first 500mm (max) centres along free edge. Upstand plugged and screwed to abutment in top third of each length only.

Parts list

  • EWI (Woodfibre) System With Rendered Finish [EW01]

    Composite woodfibre board. UdiTherm SK back board, Diffutherm NF (T&G, renderable) top board. \ Fixed mechanically to substrate in accordance with manufacturers recommendations. \ Base Coat - levelling on substrate: 90% contact required around edge of boards between board and substrate to prevent thermal bypass. If substrate is very uneven, use base-coat material around edge of board to achieve contact. \ Thermal conductivity: 0.045W/m2K. GWP 0.

    Unger \ www.unger-diffutherm.de \ Reference: UdiFRONT. \ Render: UDI Perl.

  • H71b Lead Sheet Soakers [RF09C]

    Rolled lead sheeting. \ Soakers 1.50 to 1.75mm (code 3) lead sheet. \ To BS EN 12588. Tolerance (by weight): ±5%. Colour marked for thickness. \ Dressed over existing monopitch verge flashing, up and under stainless steel capping. (Refer to Lead Sheet Association LSA publication 'Rolled Lead Sheet: The Complete Manual'.

    Contractors choice

  • Stainless Steel Flashings [RF09]

    To BS EN 10088-2 and BS EN ISO 9445-1 or 9445-2. Austenitic alloy grade 1.4301 (304). Thickness 0.4mm. Mill finish. Minimum lap as per drawing. Screwfixed with roofing screw and compressible washer.

    Contractors choice

Revisions

  1. Admin - 2015-04-29 14:59:44

    DWG file updated. General formatting amendments.

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  2. Admin - 2015-03-27 17:02:15

    Preview image and .pdf file updated.

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  3. Admin - 2015-03-24 18:11:11

    General formatting. Introduction expanded. Technical description approved doc links expanded. Notes added. Parts list updated with suppliers links.

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  4. Admin - 2015-03-13 16:01:44 [Displayed version]

    Errors removed

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  5. Admin - 2015-03-13 15:54:30

    Technical description updated. Parts list expanded.

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  6. Admin - 2015-03-06 13:41:55

    First version

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