Roofing Problem

scholes

Hi we had an extension build a few years ago by a cowboy builder and he used a roof called nordman sheets which im sure is excellent but he didn't put it up properly and there are lots of gaps around the velux windows e.tc. and we are losing all our heat through it. Does anyone have any recommendations for roofers and an idea of how much it would cost to replace this roof with slates.
The extension is single story 16 foot by 20 foot and it is hipped with 3 velux windows.

Thanks

teepee

put up a few photos at different angles , for clarity .
Pictures can say a thousand words

Slig

There may be more issues than just prce I'm afraid. Sheet metals are often used where there is a restriction on pitch, they can be laid at a much lower gradient than slates or tiles. They are also much lighter meaning that a lighter roof structure can be used. The sheets are also fixed differently than slates (often horizontal purlins are used at large centres in lieu of rafters as it saves timber.)

This essentially means that it may not be possible to just remove the Nordeman, add a membrane and slating battens and slate the roof. As a previous poster suggested post some photos so we can have a look and throw some ideas at you. Maybe it could be worth looking at working on the ceiling instead, removing the existing plasterboard, adding an air proof membrane and insulating.

scholes

Hi Thanks all for the replies ,

I havent had a chance to get up and get photos yet, ill get some up soon, Its just dark when i get home.
The pitch of the roof is 11 degrees A builder that was working up the road came in and had a quick look and said that the velux windows should not have been installed at 11 degrees? and that were lots of gaps e.t.c. He was very busy so maybe will get a quote from him. He said it would be better to take the whole roof off and put an apex on and proper slates
e.t.c. I was looking at the velux website and it says you can get boxes to lift up the velux windows, but my question is , rather than
going to the trouble of apexing the roof is there such a thing as a slate that would go on at such a low angle? Hope all this makes sense

Thanks

sydthebeat

scholes wrote: »

Hi Thanks all for the replies ,

.........., but my question is , rather than
going to the trouble of apexing the roof is there such a thing as a slate that would go on at such a low angle? Hope all this makes sense

Thanks

no.

the lowest pitch for a slate roof is 15 deg AFAIK, and thats using a particular type of slate.
If the problem just exists around the velux then it may be over kill to replace the whole roof. However its impossible to comment without seeing it on site.
The Rolls Royce solution would be to replace the roof with a proper pitched apex roof.

DOCARCH

There is a Roadstone tile (Centurion) that you can get down to 10 degrees (subject to technical guidance).

As mentioned earlier, the difference in weight between a roof tile finish and the Nordman sheet would be quite considerable so before considering going down that route I would suggest professional/structural advice.

One main problem I would see here, in the long term, is the Velux. The minimum recommended pitch of a roof for Velux windows is 15 degrees, anything below that and they have a tendancy to leak!

Bracken81

Im surprised your roof hasnt been leaking at all
your lucky enough by the sounds of it

I've seen Slates used at minimum 15 degrees over the years this would be with a certian type of slate, designed for such shallow pitches
Id say 11 degrees of a pitch could well be pushing it tho

have a look at Tegrals website, they might have some more ideas/info there for you

gman2k

Bracken81 wrote: »

Im surprised your roof hasnt been leaking at all
your lucky enough by the sounds of it

I've seen Slates used at minimum 15 degrees over the years this would be with a certian type of slate, designed for such shallow pitches
Id say 11 degrees of a pitch could well be pushing it tho

have a look at Tegrals website, they might have some more ideas/info there for you

Tegral tech dept can provide specs for ultra low angles no problem. The build up underneath can change considerably however.
11deg is possible, but may be expensive, and the Velux may be a difficulty (contact their tech dept for advice/ detailing).
There probably is some other restrictions on site that has kept the angle to 11.

scholes

Thanks a million for all the helpful replies, the ideal solution or rollsroyce solution would be to apex it , it may be better to bite the bullet and get it done (if it can) just dreading the costs.

thanks again really appreciate all the advice, gives me a starting point.

Slig

There are other options than slates, both copper and zinc can be used on very low pitches for example. Usually when a roof is done at that low a pitch it is usually to fit it in below a first floor window, avoid external services such as down pipes or soil & vent pipes or to keep neighbours happy (less height means less over shadowing.
A photograph of the rear could show someone here the existing situation and hopefully identify any potential problems you might encounter with putting on a proper pitched roof.

It should also be noted that homebond recommend that the minimum pitch for slates and tiles of 17.5 degrees in non-exposed sites, obviously a steeper pitch (22 degrees I think) in exposed sites. I would not recommend using slates on any roof less than 27 degrees pitch and ideally 30 degrees.

moonshadow

sydthebeat wrote: »

no.

the lowest pitch for a slate roof is 15 deg AFAIK, and thats using a particular type of slate.
If the problem just exists around the velux then it may be over kill to replace the whole roof. However its impossible to comment without seeing it on site.
The Rolls Royce solution would be to replace the roof with a proper pitched apex roof.

There is, the product that the builder has used,

"Our award winning Nordman Tile-Sheet Steel Roofing is versatile, long lasting & suitable for any pitch from vertical down to 4 degrees pitch.
Offering many of the benefits associated with the Nordman Tile-Sheet but with added insulation, the Nordman Insulated Tile-Panel is suitable for any pitch from vertical down to 8 degrees. "


The op has said he is losing heat through the tiles,heat is lost through a ceiling,an attic roof space should not be warm......should it?

Slig

moonshadow wrote: »

There is, the product that the builder has used,

"Our award winning Nordman Tile-Sheet Steel Roofing is versatile, long lasting & suitable for any pitch from vertical down to 4 degrees pitch.
Offering many of the benefits associated with the Nordman Tile-Sheet but with added insulation, the Nordman Insulated Tile-Panel is suitable for any pitch from vertical down to 8 degrees. "


The op has said he is losing heat through the tiles,heat is lost through a ceiling,an attic roof space should not be warm......should it?

Again, without knowing the situation its hard to tell. With a low pitched roof, especially if there are roof lights in it, its not uncommon for the ceiling to be fixed directly to the underside of the rafters meaning there is no attic space. It is always difficult to flash around projections in a sheet material so maybe there are gaps and voids visable where the flashing has moved

churchtown2012

hi i used nordman many times before i can say i never had a problem with it ( no connection with nordman) i'd say the roof lights are poorly fitted...try contact nordman to see what they say