Overcladding to Existing Roofs

When considering roof replacement, the prospect of disruption, inconvenience and loss of revenue could be quite daunting. There does come a time however, when repeated on-going maintenance is no longer a cost effective option, and replacement is the only long term solution.

Over the years, we have carried out many successful roof refurbishment projects to occupied buildings, whereby the Client has carried on with their operations below, with no disruption whatsoever. 

A very successful method of hassle - free roof replacement, is by over cladding the existing coverings using the latest roof sheeting materials. The benefits of this method are as follows:

	No disruption below as existing roof is retained in place
	No loss of revenue due to closure of building
	Upgrade thermal performance of building by introducing insulation between the old and new roofs
	Improve natural daylight by introducing translucent roof panels

The project illustrated on this page is a Contract recently completed by Curtis Moore, whereby 11, 500 sq.m. Of over-roofing was installed to a building in Ayrshire, Scotland.

The building houses a facility which manufactures components for the aviation industry. The project duration was thirty weeks during which, the Clients operations continued below without disruption.

Under normal circumstances, an over-roofing system would utilise the existing roof purlins to carry the zed support rails. On this project, the existing purlin spacings were inadequate to carry the composite panel specified by the client.

A scheme was designed which involved the installation of new cleats and roll formed purlins which were secured to the existing roof trusses. To enable the cleats to be fitted, holes were required to be cut on the existing sheeting to expose the rafter back. As the building was in production manufacturing aircraft components, it was imperative that no debris or objects fell through the cut holes and on to the shop floor below. To ensure that no items fell, catchment hammocks were manufactured which slid under the rafter and provided protection during the cleat installation process. These hammocks were subsequently removed, and profiled patches were fixed over the holes.