Spray Foam Insulation

Technical Data
Sheets

DURATHERM OS Spray foam system

The Client:	GWESPA ( Alfred McAlpine / Network Rail Western Territory Framework Arrangement for the Maintenance & Renewal of Earthworks & Structures ) Designer - Tony Gee & Partners. Sub-contractor - Cosy Home Site - Howard Street, Shrewsbury. Project - Bridge Infill: Infilling of approximately 30 redundant structures ( where there is no longer a right of way or need for the structure ) to reduce maintenance liability.

The Problem:	Redundant structures ( eg; the railway that ran below was removed some time ago ) that support roads / footpaths / car parks. Cannot demolish as the roads provide access or structure is in use as car parking. These structures require regular inspection & maintenance unless they can be infilled from below. But how to ensure the brick arches that give the intrinsic strength, and other voids, are fully filled?

The Solution:	Duratherm spray applied high strength foam is applied to the brick jack arches. The first 2-3 metres of the space are filled in with 6N fill, allowing the spray contractor in to a convenient sized space to apply the foam where needed. Then the remaining void in the middle is filled with expanding concrete.

The Outcome:	All works can be carried out from below with no disruption to roads, footpaths or car parks No need to demolish the bridge No requirement for future inspection or maintenance