Bonnet tiles setting out

[Dee]

So, started laying roof tiles on small hip dormer reusing plain concrete tile etc. 

 

Battons matched to original roof which has dictated the gauge on the dormer

 

The problem is this.... Got as far as only the second row of tiles and the bond is off... 1/3 and 2/3 (see image) 

Laying the tiles left to right and it works out to an exact number of full tiles. 

 What am I doing wrong? 

 

[Onoff]

Is the roof / hip angle slightly different to the original maybe?

[PeterW]

Not sure what you mean ..?

 

Bonnets won't gauge correctly as well as normal tiles but I can't see why the would run out so far as a third out. 

 

 

[Tennentslager]

I know nothing about roofs but the corner tile looks too high and needs to come down just a tad.

[PeterW]

Think I may have spotted your issue ... how deep is that hip batten ..??

 

Looks like it's throwing the whole bonnet forwards. 

 

Good visual guide here 

 

http://www.gare.co.uk/roof/hips.htm

 

[Dee]

@PeterW. the hip batton is 25mm deep, same as the others. It looks deeper because the batton to the right had sunk, it's the same now I've corrected it ... What's the solution? 

@Onoff. Both roofs are the same angle 45 degrees 

The bonnets don't pitch up as much as the other roofs I've seen. 

I've devoured Gare, useful visual

 

Edited April 4, 2017 by Dee

[PeterW]

So you may want to cut the bottom tile to make it "bond" correctly - are you sure they aren't Arris tiles on the corners..?? Bonnets tend to kick up more on the edges.

 

Picture below may help

 

 

 

[bassanclan]

It looks to me that the gauge is set too tight for that bonnet.

 

I assume the bonnet is not original to your roof.

 

If your gauge is say 90mm, then imagine it was 100mm it would push the bonnet up, therefore moving the second row of tiles across.

 

This could be solved with a tile and a half, or by moving the bonnet up so the bottom of the bonnet would not be exactly inline with the row of tiles by say 10mm, or you might find you have enough variation in the width of the tiles to have a pile of wide and a pile of narrow tiles to overcome this, but more fiddly and time consuming

[Dee]

@PeterW. I assume they are bonnets! I thought arris had a sharp angle on them.... I must admit mine don't kick atall 

[MikeSharp01]

Have you got a double row (double cover / starter course) on the base line, not sure I can see it in the picture, without it the water will run through the gaps on the base row and into the fabric also the geometry alters quite a bit!

[Onoff]

25 minutes ago, MikeSharp01 said:

Have you got a double row (double cover / starter course) on the base line, not sure I can see it in the picture, without it the water will run through the gaps on the base row and into the fabric also the geometry alters quite a bit!

 

Just realised why ALL our felt is rotten along the bottom and in turn the tops of the wodden facias thanks to this.

 

Lack of double row/double cover/starter course!  

 

[MikeSharp01]

Here is the roofing bible I have been working with.. seems comprehensive but of course I don't know what I don't know!

 

https://www.fixmyroof.co.uk/videos-and-guides/pitched-roof/slate-a-roof/#

 

[bassanclan]

Yes, there should be a course of eaves tiles (not visible) and ideally felt support tray too

[PeterW]

Only really applies to older rosemary or commons - onterlocking modern tiles don't need the bottom course. 

[bassanclan]

yes obviously, this thread is only about plain tiles.

[Dee]

@PeterW

@MikeSharp01

Yes I have put a double row at the eves. 

I think I'm going to have to live with an uneven side lap as I all my very comprehensive search for reclaimed concrete plain tile and a half has resulted in a grand total of 11 tiles!!! 

Thanks for everyone input 

[PeterW]

@Dee you can cut tiles to fit with a decent grinder - may look better 

[Ferdinand]

8 hours ago, Onoff said:

 

Just realised why ALL our felt is rotten along the bottom and in turn the tops of the wodden facias thanks to this.

 

Lack of double row/double cover/starter course!  

 

 

Think that is easy to fix by a roofer inserting a something something membrane under the bottom 2ft or so.

 

Just had that done on a 40 year old roof.

F

 

[Dee]

@PeterW

I've set out 4 rows on the front face with each row decreasing by one tile as I progress upwards.... But it's getting gappy! And without tile and a half I'm left with a gap of about 65mm.a time cut to that would look bodged or not? 

Losing the will to live /tile! 

[Dee]

@PeterW

An update for those who have given me such great advice and support... Thank you! 

[PeterW]

Looking good @Dee...!

[bassanclan]

looking good, but it doesn't look like you've put any compo under those bonnets???

Its a good idea to do this as you go, so hopefully you have just laid them loose and not nailed them in!

[Dee]

@bassanclan

You've spotted the deliberate mistake! 

I tried to do as I went on the last.. and only other hip....I did and I made a total fist of it. So this time I'm doing  it at the end in one go as it's such a small roof. 

 

[Dee]

And I don't understand why the bonnets don't kick up more. The others I've seen sit virtually horizontal 

[bassanclan]

If the roof was less steep (e.g. 35 degrees) then the bonnets would kick up more, but personally I think they look excellent how you have them in your picture, it means you are seeing more of the tile and less of the compo