A temporary roof is one of those specialist scaffolding items that most homeowners have never had reason to think about until suddenly they need one, and then it turns out to be essential rather than optional. A re-roof carried out in autumn or winter, an extensive roof repair after a storm, a chimney rebuild where the roof needs to be opened up for days at a time – all of these are situations where a temporary roof over the scaffolding protects the exposed structure from weather while the work is done.
The concept is simple. A conventional roof scaffold gives Access towers and edge protection to the roof surface. A temporary roof extends the scaffold with a lightweight, waterproof cover over the top of the working area, allowing the existing roof tiles to be removed and the structure to be worked on while the interior of the house remains dry. Without a temporary roof, a re-roof project has to be carried out in short weather windows, tiles have to be replaced daily to avoid rain damage, and even then the interior is vulnerable if the forecast is wrong.
A standard temporary roof consists of aluminium beams spanning the scaffold at the top, with plastic sheeting stretched tautly over them and secured at the edges. The beams create a shallow pitch to shed water off one or both sides of the scaffold. On smaller domestic jobs a simple monopitch (single-slope) roof is adequate; on larger projects a duo-pitch (double-slope) roof mimics the shape of the actual house roof and provides more headroom for work. The material can be either single-use plastic sheeting or reusable panel systems, depending on the duration and cost tolerance of the job.
Temporary roofs need to be designed rather than just erected, especially in exposed coastal locations like Bournemouth where wind loading is significant. A temporary roof presents a large sail area to any prevailing wind, and if the connection between the temporary roof and the scaffold below is inadequate, the wind can lift the whole assembly. Proper temporary roofs are tied down heavily, with the sheeting itself stretched taut so it does not flap or catch wind, and the number of ties and the strengthening of the underlying scaffold is calculated based on the exposure of the site.
Temporary roofing is not cheap because of the design work, the additional equipment, and the strengthening of the underlying scaffold. Roughly, a temporary roof over a two-storey house scaffold might add fifty to eighty per cent to the base scaffold cost. This is not a rounding error, and it needs to be factored into the budget for any project where a temporary roof is genuinely required. On the other hand, a re-roof project without a temporary roof that runs into bad weather can lose weeks and result in water damage that costs more than the temporary roof would have.
When to use temporary roofing is largely a matter of timing and duration. A short re-roof in June, taking a week in reliable weather, may not need a temporary roof – the risk of a rain event during the working days is manageable and the roof can be sheeted with plastic overnight. A re-roof in October running for three weeks, on the other hand, will almost certainly encounter significant rain, and a temporary roof is the sensible answer. Any roofing contractor planning a re-roof in autumn or winter should be recommending a temporary roof as part of the specification.
Ventilation under a temporary roof is a small detail that matters more than it seems. A tightly-sealed temporary cover over a working scaffold creates a humid environment underneath, particularly in mild damp weather. This affects the workers, the tools, and any exposed timber in the roof structure below. Good temporary roofs are designed with venting at the ridge and eaves to allow air to move through, keeping the underside relatively dry.
Complex roofs – hipped roofs, roofs with dormers, roofs with valleys and multiple chimneys – need temporary roofing that adapts to the shape below rather than a single simple pitch. This is where a proper scaffolding company’s temporary roofing capability shows. Simple jobs are within the capability of most CISRS-trained scaffolders; complex jobs need a company with experience in temporary roofing specifically and access to the appropriate long-span aluminium beams and sheeting systems.
The practical takeaway is that if the roof project is significant in scope, likely to run for more than a few days, or scheduled for autumn or winter, the conversation with the scaffolding provider should include temporary roofing from the start. It adds cost but it also removes weather risk, and on any substantial project the certainty is worth paying for. Any temporary roofing specialist in Bournemouth used to this type of work will be able to specify the appropriate design and give a firm price rather than adding extras during the job.
