SAES Getters Roof Waterproofing, Lainate
Prima Pavimenti waterproofed 1,200 square metres of industrial roof at SAES Getters in Lainate with Impermax Polyurea H from Krypton Chemical, applied on the existing bituminous membrane. The finish is a white aliphatic polyurethane.
Overview
Prima Pavimenti waterproofed 1,200 square metres of industrial roof at SAES Getters in Lainate with Impermax Polyurea H from Krypton Chemical, applied on the existing bituminous membrane. The finish is a white aliphatic polyurethane.
| Place | Lainate, Italy |
|---|---|
| Building | SAES Getters S.p.A. |
| Area | 1,200 square metres |
| Substrate | Existing bituminous membrane |
| Membrane | Impermax Polyurea H |
| Finish | White aliphatic polyurethane |
| Applicator | Prima Pavimenti Speciali |
SAES Getters makes advanced functional materials and vacuum components. The roof over that plant is an industrial deck in the open, at Lainate, north of Milan. Krypton Chemical made the resin. Prima Pavimenti applied it.
Challenge
An old bituminous membrane fails quietly. Fine cracks at the joints let damp under it before a drip shows inside. Stripping 1,200 square metres of that membrane means opening the roof, the dust, and the risk of rain on a bare deck over a plant that is still working.
An industrial roof at Lainate takes heat, ultraviolet light, hail and ponding, and people walk it to reach plant. The new film had to go on what was already there, stay elastic, and take a white finish so the roof reflects some of the sun. Leaving a loose patch or trapped vapour under the new film turns the repair into a lid.
Solution
Prima Pavimenti applied Impermax Polyurea H directly on the existing membrane. No strip-out. The build is a wash, repairs where the old membrane had let go, vents, elastic coves, a primer, the polyurea, and a white aliphatic polyurethane finish that resists ultraviolet light.
The white finish is the sun coat. The polyurea is the waterproofing. Elongation at break is about 400 percent and tensile strength about 15 MPa, with Shore hardness about 90A / 40D. Those are typical product data, not a coupon from this roof. With the aliphatic finish the system is assessed to EOTA EAD 030350-00-0402 in the severe roof category, working-life class W3 (25 years). Without that finish the class is W2 (10 years). Hail impact is classed severe under UNI EN 13583. Fire classification on the system includes Broof(t2) to EN 13501-5.
Application
The old membrane was washed with a high-pressure rotary jet, not demolished. The wash takes efflorescence, dust and loose dirt without cutting the membrane under it. Areas that had detached were put back by welding, by mechanical fixing, or by a local replacement. Outlets were checked and replaced where they needed it.
Vents in thermoplastic elastomer were installed on a grid of about one every 30 to 40 square metres, so vapour under the old membrane has a way out. Elastic coves were formed at corners, upstands and details, with butyl strips or a polyurethane sealant, so the thermal movement is not concentrated on a sharp arris. Primer went on by roller or airless. The two-component membrane followed by roller or airless, then the white aliphatic finish. Outlets and upstands take the same membrane as the field.
Results
SAES Getters in Lainate has 1,200 square metres of roof in Impermax Polyurea H over the old bituminous membrane, with a white aliphatic finish and vents so vapour can leave. Prima Pavimenti applied it. Krypton Chemical made the resin. The old membrane stayed, once the loose areas had been made sound.
Products
Impermax Polyurea H
Two-component polyurea membrane on the existing bituminous membrane, applied by roller or airless, with a white aliphatic finish. Elongation about 400 percent. Product data.
FAQ
What was applied at SAES Getters?
Impermax Polyurea H, a two-component polyurea membrane from Krypton Chemical, over the existing bituminous membrane. The area is 1,200 square metres. Prima Pavimenti did the work in Lainate, by roller or airless, and finished it with a white aliphatic polyurethane.
Was the old membrane stripped?
No. The new membrane went on the existing one. Loose areas were made sound by welding, mechanical fixing or a local replacement. A loose boil under the new film is a leak with a lid, so that repair is part of the waterproofing.
Why are there vents?
Vents in thermoplastic elastomer were set at about one every 30 to 40 square metres. Vapour under the old membrane needs a way out. Without it, the new film blisters and the bond is lost.
What do the certification figures mean?
The system is assessed under EOTA EAD 030350-00-0402 for roofs in the severe category: working-life class W3, 25 years, when the aliphatic finish is used, and class W2, 10 years, without that finish. Hail impact is classed severe under UNI EN 13583. Those are product assessments, not a measurement cut from this roof.
What are the mechanical figures?
Elongation at break is about 400 percent, tensile strength about 15 MPa, Shore hardness about 90A / 40D. Those are typical data for Impermax Polyurea H. They were not measured on a sample from Lainate.