Low pitch roof 11 degrees

damiand

Hi

I am building an 88sqm extension to the side of my house. The pitch of the roof is 11degrees. Only material that I can find that will work at such a pitch is Nordman roof tile sheets, http://www.nordman.ie .

Has any one experience using this material. It appears to be easy to erect, colour guaranteed for 25 years and they expect that the sheets will last for 45 years.

I am weary of the potential noise implications.

Any commects or advice would be warmly welcomed.

Damian

sinnerboy

no direct experience . but it seems technically sound .

however you do tend to see it used on McBurgers etc buildings. when you drive by the eye may be fooled but close up it looks like what it is - a metal roof . It may put future owners off .

torch on felt or copper or zinc may be a better option

or using a double pitched ( tiled ) roof with a valley next to the original structure may work too ?

Mellor

As said above, felt (or a pvc membrane) will also work.
As will zinc or copper, which will look much much better

HeatLoad

It is a sheet of plastisol coated corrugated steel, it will look like a sheet of plastisol corrugated steel and will wear like a sheet of plastisol corrugated steel. Personally I would felt the roof to waterproof it then lay real tiles/slates on top

sinnerboy

HeatLoad wrote: »

It is a sheet of plastisol coated corrugated steel, it will look like a sheet of plastisol corrugated steel and will wear like a sheet of plastisol corrugated steel. Personally I would felt the roof to waterproof it then lay real tiles/slates on top

got to be carefull there - the roof won't leak but the tiles or slates may be sucked off in high winds

gman2k

I specced low pitch roofs before with a roofing company from South Kildare (you know who). It can be done with real slates - but probably over a 'flat roof' type construction under - torch on membrane when you get to pitches this low.
You'll need to be increasing the head lap of the slates, and counterbattening

muffler

gman2k wrote: »

I specced low pitch roofs before with a roofing company from South Kildare (you know who). It can be done with real slates - but probably over a 'flat roof' type construction under - torch on membrane when you get to pitches this low.
You'll need to be increasing the head lap of the slates, and counterbattening

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damiand

Thanks all. I will probably go with it for a number of reasons the most important of which is thats its cheap. I have been quoted just under €3,000 all in to cover an area of over 90sqm.

I will still price a zink and copper roof but I dont think the price will be in the same ball park.

Again thanks.

slavetothegrind

i too am going to use nordman roofing but the insulated product ( 80mm high density foam) this should drastically reduce any noise as well as giving excellent insulation qualities.

In my humble opinion it is easy to fit, and easy to fit correctly, unlike doing a proper torch on job. We all know how many ways they are fcuked up!!!

For me it is a budget choice and my area is a lot smaller.

In an ideal world i would love a copper roof, gotta love the green oxidised look!
But alas i have nay got the dosh!

Anyway OP good luck with your project!;)

chrisinwestcork

i have used the nordman roofing sheets and i think they are a good job! i went for the sheet only and added kingspan between the rafters( 1oo mm) then plywood and then the plaster board. sound is not a problem!. ask them to send u the list of places they have done,dunes stores in clon, west cork is where i went to look and that was the reason i went for them, nothing to do with cost!!! zink roof? an other trip to the bank lol

damiand

Thanks Chris,

Was the insulation, ply wood and plaster board on the ceiling or just below the roof ?

damiand

Thanks Chris,

Was the insulation, ply wood and plaster board on the ceiling or just below the roof ?

Also what distance do you have between the rafters ?

chrisinwestcork

damiand wrote: »

Thanks Chris,

Was the insulation, ply wood and plaster board on the ceiling or just below the roof ?

Also what distance do you have between the rafters ?

distance between rafters is 900mm insulation is up in the refters and ply and plaster iu under as it my finished hight

Carpenter

Hi
I have used it many times and it is fine (even on my own house)if you insulate well the sound is not a prob I used rockwool and plenty off it and all is cool .
But if you are using downlighters leave room for air as they heat up a bit

Builderfromhell

AT risk of stating the obvious, be sure to allow adequate ventilation to underside of Metal roof, or/and include a layer of vapour membrane as any moisture laden air will easily condense on cold metal roof.

I use meatl roofs all the time and manage to get up to 300mm of rockwool between ceiling and roof void. I also include mesh at eaves vents to keep birds and bats out.

raher1

Did you use nordman? If so did it work out ok?

antiskeptic

damiand wrote: »

Hi

I am building an 88sqm extension to the side of my house. The pitch of the roof is 11degrees. Only material that I can find that will work at such a pitch is Nordman roof tile sheets, http://www.nordman.ie .

Has any one experience using this material. It appears to be easy to erect, colour guaranteed for 25 years and they expect that the sheets will last for 45 years.

I am weary of the potential noise implications.

Any commects or advice would be warmly welcomed.

Damian

I've had a 12 degree roof on a 400 sq ft extension this last 12 years. It's slated with bog standard man made slates and has veluxs in. There's been no issue despite the fact that the roof faces into the worst of the weather. No issue that is apart from a leak due to a few cracked slate (trampled on when fitting a dish - they get weak with age) exposing the fact that the felt hadn't been properly dressed around the velux. Opening things up to replace these slates revealed all well with the underlying structure.

A pair of large velux' (about 1.5m x 0.9m each) won't stay open on their own, but the smaller one's operate fine (though you have to ensure you don't open them to widely when there's a risk of rain).

The slates happen to have a uneven surface (which is meant to replicate the appearance of rough hewn slate) and this would probably reduce tendency for capillary action to draw water uphill.

CBIBB

Hi antiskeptic,
There is a Great Roof tile that Roadstone are doing called "The Centurion Roof Tile"
It is a Concrete Roof Tile which is fitted as any standard tile.
The Tile can go down to pitches of 10 degrees with a rafter up to 5m and 12.5 degrees with rafter up to 10m.

I would not be putting on slate as you will not get any guarantee from the suppliers, but you will from Roadstone when fitted correctly.

You would always put a HP Underlay with roof pitch below 22.5 degrees and an overlap of 225mm.

Hope this helps somewhat