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Last edited 13 Nov 2017
Profiled and cut to fall roof insulation - case study
Location: Menstrie, Clackmannanshire, Scotland
System: Stylite Profiled & Cut-To-Fall Roof Insulation EPS150
Menstrie Primary School Nursery building had an old metal deck roof which was coming to the end of its serviceable life and beginning to fail. Installed over 30 years ago the flat roof had been designed with minimal fall leading to poor drainage. Standing rainwater was increasing the loading on the roof and causing deflection of the deck, adding to the drainage problems.
Clackmannanshire Council wanted a cost effective upgrade solution to provide an adequate fall without having to replace the whole roof. To meet current Building Standards they also wanted to significantly improve the thermal performance of the roof.
 Design solution
The roofing contractor, working on behalf of the council, specified two layers of Stylite Expanded Polystyrene (EPS) insulation. The first layer consisted of a flat sheet contour cut on the underside to match the profile of the existing metal roof and mechanically fixed into position. The second layer consisted of tapered pieces of insulation which were adhesively bonded to the underlying boards to provide sufficient fall to improve the drainage of water from the roof. To complete the system a single ply membrane was applied to the insulation boards to provide the necessary waterproofing protection.
- Cost effective retrofit solution.
- Cut-to-fall design solved drainage problems.
- Lightweight - no added loading.
- Excellent thermal performance.
- Quick and easy.
The upgraded roof solution was more cost effective than a full replacement and the cut-to-fall design has provided the required slope to allow excellent drainage. The lightweight properties of EPS has meant very little extra load has been added to the existing roof whilst its thermal properties have allowed the roof to achieve the specified U-value and meet Building Standards.
The roofing contractor said; “We were very happy with how this project progressed, the Stylite profiled boards fit perfectly over the existing roof giving us a flat and even surface to work off. All the tapered pieces of EPS were labelled clearly so we could install the whole roof within a few days.”
 Find out more
 Related articles on Designing Buildings Wiki
- Beam and Infill Suspended Floors.
- Beam and Polystyrene Block Suspended Flooring - Case Study.
- EPS Geofill Civil Engineering - Case Study.
- Flat roof.
- Passivehaus Foundation Insulation - Case Study.
--Styrene Packaging and Insulation Ltd 09:47, 13 Nov 2017 (BST)
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