Permadeck®
the permanent roof
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E&OE      The text and graphics of this website are Copyright © 1996-2011 all rights reserved by Seamless Roofing Ltd.  Permadeck, Thermadeck & Flexiroof are registered trade marks.  The contents of this website are subject to review and are a guide only and do not represent a binding offer. The BBA logo is Copyright © British Board of Agrément.  The Fairtrades & HomePro logos are Copyright © HomePro Ltd.

Lead, Copper & Zinc Roofs
We have used Permadeck successfully over many years, often on listed buildings, as a great alternative to Lead, Copper and Zinc. As well as colour matching we can reproduce the standing seams (lead rolls or 'bottles') of these old systems. Below are pictures of a care home development:
The copper roofs on this town house were never very successful. The Permadeck is though!
Here's a good one...
This lead roof above was on a BRAND NEW block of flats. It leaked. So it was replaced with another lead roof.  It leaked too. So we replaced the lead with PERMADECK, which can't leak.  Another problem solved with Permadeck. Imitation lead rolls can be fitted if the roof is visible, in this case only the birds could see it and the developer was glad to get rid of them!
Simulated copper - we’ve re-roofed a number of these town houses and they look really 1st class when finished.
Permadeck - the ‘green’ alternative to lead
As you know lead is highly toxic and if you consider it’s whole-life logistics: mining, refining, milling, transport, wholesaling, fitting, corrosion and eventually disposal it is one of the worst possible products to specify and use.  The only argument in it’s defence is its life span. Unfortunately this is not as great as you would expect unless the very heaviest ‘code’ is used, even then any stressing of the lead ie when it gets folded and straightened out drastically reduces its life.  We regularly replace lead roofs that are less than 20 years old and lead wall flashings as young as 5 years due to stress corrosion.
 In 1986 lead was no longer recommended for warm roofs (see the English Heritage link on the Thermal page).

THEFT! Stolen lead is another good reason for using Permadeck. A recent survey showed that over 4500 churches were being stripped of their lead EVERY year! Permadeck has no value to thieves.  

In the beautiful Tay Valley at Aberfeldy, was this refurb of a standing-seam lead mansard roof that had corroded. The timbers below the standing seams were extensively rotten. We could have simulated the standing seams but since the roof is out of sight this wasn’t necessary.

Look carefully and you’ll see the old ‘lead steps’, ridge beam, and round rooflights; all very easily moulded into the Permadeck system.

Just compare the two ends of this roof:

 

The far end still has the old zinc roof with standing seams or ‘bottles’.  The Permadeck at this end now seamlessly replaces all of the pieces of zinc making the roof absolutely watertight. Every zinc or lead roof we have ever removed has shown significant rotting of both the timber below and the metal itself. There are 2 reasons for this, firstly all the individual pieces of metal never completely overlap to withstand stormy weather and, secondly, metal products suffer from condensation underneath.  

 

This Grade II listed gate-house in South Wales had its new lead stolen and, naturally, the owners didn’t want that to happen again.  In addition, their insurance company said they would not pay-out again.  

The local Planning Department recommended Permadeck as an alternative so our installation team specialising in simulated lead roofs soon had it wind and watertight - permanently.

Most roofs have at least one complex detail and some have many, so it is far from straightforward to completely seal permanently with zinc or lead.

As for condensation, recent editions of the Building Regulations have put great emphasis on eliminating interstitial condensation.  Vapour barriers and permeable membranes are now insisted upon by both designers and Building Control. Every new construction now requires the proposed roof system to pass a Condensation Risk Analysis.  (See ours at: http://seamlessroofing.co.uk/thermal.html )

Since Permadeck is both joint free and permeable none of the above is a concern.  Permadeck is also guaranteed 20 years and underwritten by its BBA certification.

 

Seamless Roofing Ltd’s Permadeck 20 roof system (BBA 93/2967) comprising 18mm DryPly plywood decking with integral heavy duty edge trims, specially formulated base resin embedded with thick glass fibre matting and an ultra violet protected and fire retardant top resin; simulated lead finish with look-a-like lead rolls running from ridge to eaves at 600 nominal centres.       (Suggested specification)

Note that Permadeck becomes matt over time

On the left the picture shows the reproduction standing seams ready to have the final lead grey resin applied. On the right is the finished roof.