Roofing guarantee

[WWilts]

New build in progress. Hipped roof. No gables.

 

Roof trusses placed in slightly wrong position. Consequently, one elevation has a roof slope of 18.4 degrees instead of 19 degrees.
 

Covering: Proctor Roofshield air permeable water resistant membrane. Topped by Redland Cambrian slates & Marley Universal ridge tiles.

Some trees nearby could grow to above the roof height in a few years. Tree debris then might block the Cambrian slate sidelock channels. Water buildup would then test the roofing membrane.

 

Questions:

 

1) Is it possible to buy insurance specifically for roofing work? To cover defects (insurance backed warranty)? Does normal household insurance do the job after completion?

 

2) What precautions to take?
(Cut the relevant tree branches, 
Allow a wider lap of roofing membrane,
Ensure maximum permitted slate headlap on that shallower slope,
other?)

 

 

 

 

 

 

 

[nod]

Cut the trees back and keep them cut 

There are many slate roofs that have been in place 100 plus years Without any membrane 

The roof will see you out 

Uour overthinking it and worrying about nothing 

[PeterW]

1 hour ago, WWilts said:

Is it possible to buy insurance specifically for roofing work? To cover defects (insurance backed warranty)? Does normal household insurance do the job after completion?

 
The build (latent defects) warranty should cover it. 
 

1 hour ago, WWilts said:

Consequently, one elevation has a roof slope of 18.4 degrees instead of 19 degrees.

you’re overthinking this … just check the slate spec and ensure the roofer follows this. 

[Roundtuit]

We've got trees above eaves height without a problem; just clean your gutters out regularly ?

[Dave Jones]

https://scpbuildingproducts.co.uk/products/leaf-trap-for-downpipes

 

[WWilts]

15 hours ago, PeterW said:

(latent defects) warranty

Would a latent defects warranty cover vs roof leakage for 10 years?

[WWilts]

15 hours ago, nod said:

many slate roofs that have been in place 100 plus years Without any membrane

True.

These are manmade slates though. Interlocking, not double lapped

Others report leaks due to tree debris etc getting into the sidelock channels
https://www.diynot.com/diy/threads/low-pitch-cambrian-tiles-leaking.464038/

Hence trying to take preventive action