regulations Re-roofing a victorian terrace +improving its thermal element

[Neverfinished]

I need to re-roof/slate my 'typical' town-terrace property + upgrade its insulation. As a 'hands-on' tradesmam/handyman my work included small roof + gutter repair issues etc; So whilst aware + competant of some of the work & its detailing to meet regs, I need an amount more knowledge to accomplish everything this entails. I plan to be hands-on, assisted by say a roofer/tradesman (retired?) able to work up to the high standard I desire.

I think, to obtain the guidance needed I'd best seek some practically orientated on-site advice/consultation, perhaps from a local roofer (retired?) or architect. . . . Can anyone suggest the precise profession/type of person to ask. I DON'T want to be just fed theory - I want practical tips & a site visit or 2.  I'm north of Leicester.

Info about current roof etc:-

Roof renewed in the 70's in cement tile in an all-round poor quality job, now needs doing sympathetically. My finances are limited - I'd input some tools, be hands-on + my limited knowledge; further motivated  to keep job in-house as scared of  being 'hoodwinked' by a deceitful professional.

 

A bonding gutter will be required where my roof joins neighbour, see left on photo 1.

Is a cold roof - but to up-grade its thermal element I'd ideally now add insulation above rafters to the existing between rafters, thus course raising roof height by say 50mm too, but possibly unrealistic! . . as need to integrate with neighbours roof. Adding more insulation within existing attic room impractical as seriously impinges on current limited height/width.

Thanks any suggestions.

 

[saveasteading]

1. I would suggest finding an old (of the time) manual of building details, that will show how this is built.

Second hand book shops, or online.

 

What is the issue that the current tiling needs to be replaced? 'all-round poor quality job' sounds awful.

 

9 minutes ago, Neverfinished said:

hands-on, assisted by say a roofer/tradesman

2.Perhaps this is your starting point. First find your roofer.   

 

3. I hope your self confidence is justified. this is  a very big undertaking physically and technically. Meanwhile, while the tiles are off, the rain will be getting in.

You are going to need scaffolding, tarpaulins, tools, insurance and there is a risk of it going badly wrong as you learn on the job.

A roofer sounds like a good investment, and maybe cheaper in the long run.  They may do it in 8 weeks but you may take 20.

 

17 minutes ago, Neverfinished said:

scared of  being 'hoodwinked' by a deceitful professional.

Aren't we all.   So choose a fair and knowledgeable one.

[Redbeard]

What you describe is a hybrid Warm Roof - some insulation between the rafters - not really a Warm Roof - and some over - the 'Warm' bit, tucking up the rafters in warm stuff. However, when you do a hybrid you need to ensure that there is not a risk of interstitial condensation at the interface between the 'between rafters' insulation and the 'above rafter' insulation. The 'rule of thumb' sometimes used is to have two-thirds of the R value above the rafters and one-third between, so it is not 'cold' enough to allow condensation at the interface. (A proper condensation risk analysis is better than a rule of thumb). Even if you could 'engineer' your 50mm uplift vis a vis your neighbour's roof that would mean only 25mm between (the one-third to the two-thirds represented by your 50mm). 75mm, even of PIR, may give you a U bvalue of around 0.3W/m2K, about half as good as the Building Regs U value target of 0.16W/m2K.

[Dave Jones]

pir is expensive and a lot of work. Id the loft converted preventing use of loft roll ?