EWI to pitched roof with flashing at verge over insulation. [Version ID #206]
Detail summary
Detail for EWI up to an existing verge on a pitched roof. Where not possible to extend the existing roof verge over the insulation install new verge mini-gutter at junction between pitched roof and external wall insulation, with new Stainless steel flashing at junction between flat roof verge and external wall insulation.
Technical description
Section detail. EWI to existing pitched roof verge, with EWI extending beyond. New flashing and verge guttering added to prevent water damage to 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 (draonage 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.
Step flashings with secret gutter. For step flashings: Length: 1500mm (max), end to end joint: laps 100mm (min). Overlap to soaker upstands 65mm (min). Fixing: lead wedges at every course. For Secret gutter lining: For step flashings: Length: 1500mm (max), end to end joint: laps 100mm (min). Overlap to soaker upstands 65mm (min). Fixing: Dressed into secret gutter. Welted edge at side to be tiled. Nailed top edge to each sheet. Bottom end dressed neatly into eaves gutter.
Step and cover flashing with secret gutter. Length: 1500mm (max), end to end joint: laps 100mm (min). Overlap to soaker upstands 85mm (min). Cover to roof: 150mm (min). Lead wedges at every course. Clipped at first 500mm (max) centres along free edge. For Secret gutter lining: lengths 1500mm (min). Upstand 65mm (min) above tiles. Fixing: ressed into secret gutter. Welted edge at side to be tiled. Nailed top edge to each sheet. Bottom end dressed neatly into eaves gutter.
Parts list
-
Stainless Steel Flashings [RF09]
Austenitic alloy grade 1.4301 (304). Thickness 0.5mm. Mill finish. wdge fixed into joint chases and DPC joints.
Contractors choice
-
H71b Lead Sheet Soakers [RF09C]
Rolled lead sheeting. \ Soakers 1.50 to 1.75mm (code 3) lead sheet. \ Dressed over mini-gutter wall. (Refer to Lead Sheet Asscoaition LSA publication 'Rolled Lead Sheet: The Complete Manual'. \ To BS EN 12588. Tolerance (by weight): ±5%. Colour marked for thickness.
Contractors choice.
-
Treated softwood verge board [RF09C]
European Whitewood to class BS EN942, class J30. Size to suit existing board. Treatment required. Fixed by stainless steel nails at centres according to contractor.
Contractors choice.
-
EWI (Woodfibre) system, 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.
Revisions
-
Admin - 2015-04-29 14:56:32
DWG file uploaded. General formatting amendments.
| -
Admin - 2015-04-29 14:54:27
DWG file uploaded. General formatting amendments.
| -
Admin - 2015-03-27 17:01:00
Preview image and .pdf file updated.
| -
Admin - 2015-03-24 18:11:49
General formatting. Introduction expanded. Technical description approved doc links expanded. Notes added. Parts list updated with suppliers links.
| -
Admin - 2015-03-13 15:45:05 [Displayed version]
Technical description updated. Parts list updated with codes and expanded.
| -
Admin - 2015-03-06 13:14:46
Version 2. Category change
| -
Admin - 2015-03-06 13:11:23
First version
|
Feedback
A total of 14 users have left feedback about this detail.
Share your thoughts about this detail with other users:
-
User name
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
- Ease of sourcing materials: Easy
- Ease of sourcing skills: Easy
- Ease of implementation: Easy
- Overall cost: Low cost
-
User name
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
- Ease of sourcing materials: Easy
- Ease of sourcing skills: Easy
- Ease of implementation: Easy
- Overall cost: Low cost
-
User name
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
- Ease of sourcing materials: Easy
- Ease of sourcing skills: Easy
- Ease of implementation: Easy
- Overall cost: Low cost
Feedback summary
- 80% of users found this detail easy to implement.
- 50% of users found it easy to source skills for this detail.
- 60% of users found this detail hard to understand.
- 100% of users found the overall cost for this detail to be low.
- 90% of users found materials for this detail easy to source.
Discussion
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
User name
Leave a comment