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Our Top Ten Roofing Design Blog Posts of 2019

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It’s January, and as per tradition, we’re counting down the top ten SIG Design & Technology blog posts from last year. Our Top Ten Roofing Design Blog Posts of 2019
This time we are covering four blogs, including the new SIGA Natural Slate Knowledge Base which launched earlier in the year.
Will they come out on top? Have a look at what you missed, tell us what you want to read about, and maybe you can help us write about what you want to know in 2020.
So cue the music and lets started!

10. Flat roof upstand best practice: updated for 2019
Towards the end of 2018 the British Standard BS 6229:2018 Flat roofs with continuously supported flexible waterproof coverings was updated, and we seized the opportunity to update our hugely popular post about upstands on flat roofs.

True to form this new post which covers not only the answer to ‘how high does a flat roof upstand need to be’ but also explains why we need upstands, how to deal with level thresholds, and what to do if you don’t have the magic 150mm, together with plenty of example details for you to use, has made it to the No.10 spot.

9. BS 6229:2018 – the changes explained
Pipping our upstands post to the post, so to speak, is our introduction to the changes brought about by the new BS6229. This interview with Daniel Bosworth looks at all the key changes, how they affect different types of flat roof, the effect on zero falls roofs, rainwater disposal and thresholds, and the implications for architects on the design, specification and construction of flat roofs.

We are generally in favour of the changes brought about by the new British Standard, particularly in how they relate to interstitial condensation risk analysis and hybrid roofs.

The changes were also welcomed by many industry bodies including the NFRC, SPRA and LWRA

8. Zinc clad demonstration house in Bedfordshire
The first post from our SIG Zinc & Copper blog to make the top ten is this case study of a house in Bedfordshire clad in pristine elZinc Rainbow Red, expertly worked by master installer Richard Laver and his team from RFL Metal Roofing.

We talk to the client, Neil Shepherd of Fairfield Homes, about this four bedroomed house, the choice of cladding finish and details, and the experience of seeing a house to showcase your company ethos come into fruition.

We also begin a conversation about the excellent gutter and ridge details – more about those later.

7. Standing seam membrane roofing on luxury housing developments
This one is a bit of a surprise, it’s a post about a development of 25 luxury homes that were being built on the former garden site of a school of mission in a village in Nottinghamshire. Baxter Green features distinctive single pitched standing seam metal roofs, but they aren’t metal, they are Armourplan PSG Membrane.

The article features an interview with Nigel Fields, Midlands Area Technician for SIG Design & Technology, who describes the detailing of the project. Nigel, who won two of our ‘best roofing photo of the month’ competitions last year, went on to be highly commended in the ‘Best Trainer of 2019′ category at the SPRA awards.

6. Liquid roofing best practice
Topping out this half of our top ten of 2019 is this article about liquid roofing featuring an interview with Daniel Bosworth and Chris Page, who are Design & Technical Manager and Product Manager at SIG Design & Technology.

In recent years the variety of liquid waterproofing suitable for roofing projects has exploded and there are all sorts of products available. Dan and Chris look at the main types, describe the advantages and disadvantages of liquid waterproofing and provide some valuable advice about choosing a system, designing the roof and what to ask about guarantees.

Since this article was written a new improved version of AH-25 has been launched, Hydrostop AH+. Be sure to contact us for advice and support on the most appropriate approach for your project, be it new build or refurbishment.

5. Flat ventilated zinc ridge detail
This post originated from our (8th in our top ten) case study on the Red Zinc Clad House at Blunham, Bedfordshire, and looked at the flat ventilated zinc ridge detail which was used. Designing a zinc roof which merges into the cladding is a challenge to get right, and in this case the intention was to make the roofing and cladding feel like a single surface which wrapped the whole upper storey and roof in a single surface.

The article looked at ventilated zinc ridge details in general, what made the Blunham one special and what to bear in mind when designing ventilated ridge details in zinc, together with elzinc’s details in 2D, 3D and interactive 3D format for you to use in your projects.

4. Pyrites, Rust and Discolouration: How to Avoid a Rusting Slate Roof
This year we launched our new SIGA Slate website which includes a knowledge base of posts about how to design and install natural slate roofing and other related roofing materials. This post is the first of the knowledge base posts to make our top ten most popular.

One of the common questions we are asked about natural slate is how to avoid the risk of rust in a natural slate roof. In this article we explained what pyrites are, how rusting is caused, what its effects can be. The post looks at how to avoid specifying natural slate which might be subject to this unsightly and often damaging phenomenon.

3. Flat roof fire performance: what architects need to know
Fire is a major topic of interest at the moment, and understandably so. This post was prompted by the news of a fire which broke out on the roof of a restaurant in Manchester, believed to have been started by a patio heater.

The article looks at the external fire ratings of flat roofs, both to protect the inhabitants of the buildings (the Penetration of the fire element) but also the people and property nearby (more associated with the Spread of Flame element). It describes how these influences are dealt with in relation to BS 476 Part 3 and in particular how fire rating tests are carried out, what the fire rating letters mean and what ratings you should be considering for your flat roofs. It includes photography of recent fire rating tests and extracts from Building Regulations 2010 Approved Document B.

2. Low pitch slate roof – below 20 degrees – information and how to specify
This year the SIGA Natural Slate team commissioned the BRE to carry out a series of tests to determine whether it was possible to design and install a natural slate roof at below 20 degrees pitch, so as to determine whether such installations can be guaranteed. The topic of low pitch slate roofs is such a popular one, our article about the results has made it to the top two spot in our top ten this year.

Following the successful test results, we are happy to advise specifiers and contractors that they can choose a SIGA Natural Slate roof as low as 15 degrees (sheltered or moderate exposure) and 17.5 degrees (severe exposure) if the slates are hook fixed with a 150mm lap. If you’re looking for a way to specify a natural slate roof at below 20 degrees,

Without further ado, here’s our number one roofing design post of 2019:

1. Ventilated hidden eaves box gutter detail in zinc
Once again a metals blog post makes it to the top of the pile! Our most popular post of 2019 was the one about how to detail a zinc hidden eaves box gutter. Inspired by the Blunham house again, of course.

Hidden box gutters are concealed behind the edge of the roof, rather than attached to the eaves. This has the advantage of making it possible to have a crisp eaves detail, which can either be shallow or sharp, or flush with the edge of the building as with the house in Blunham, where the standing seam zinc cladding appears to travel up the wall and over the roof in one smooth, and apparently seamless surface. The detail used at Blunham had to be ventilated and the illustrations show how effective this gutter detail was in promulgating the ‘wrapover’ effect of the elZinc Rainbow Red and elZinc Rainbow Red Advance roofing and cladding.

Tell us what you want to read
So we’ve shared our top ten most popular post this year. We love answering architects’ questions about flat roofing, metal roofing and all types of roofing challenges, so why not ask yours? You never know, we might write a blog post about it next year.

Drop us a line using the contact form with your suggestions, or if you’re feeling brave, why not write a comment on this post? We always reply.

About SIG Design & Technology
SIG Design & Technology is part of SIG Roofing, a leading division of SIG plc, a FTSE 250 listed company and the UK’s market leading specialist supplier to professionals in the building and construction industry. We design and supply flat roofing solutions including green roofing, zinc, copper and stainless steel roofing and cladding and pitched roof coverings including natural slate and clay tiles.
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