fix a crack in concrete roof

v240gltse

hi

there is a crack ( about 2 ft long and thin'sh) in the concrete roof of a hall way that has let in ran and damaged the ceiling.

I was planning to widen the crack slightly and drill a non through hole at the thin end of the crack ( to prevent it travelling further ) and then use some sort of mastic to seal it up.

Two questions I have

1. suitable

2. what sealant should I use ?

thanks inadvance

brendan

BryanF

Just to clarify your Concrete roof is letting rain in? If this the case you may want to inspected the outside. This sounds highly suspect to me
> how old is the roof/ concrete?
> what is the concrete span?
> is there any ponding or signs of water ingress above?
> would it be best to replace it or at least seek advice from an Eng., encase the whole lot decides to fall non your head?

v240gltse

hi

yes the the crack is on the outside and while it is long at about 2 feet its very thin at its widest point and narrows down to a hair's width

> how old is the roof/ concrete? = > 30 years approx

> what is the concrete span? => 4ft x 12ft

> is there any ponding or signs of water ingress above? => none that i can see as its a very thin crack but the brick directly below the widest part of the crack is badly stained

> would it be best to replace it or at least seek advice from an Eng., encase the whole lot decides to fall non your head?

dont know if it requires this level of intervention yet but i will give it some thought

I have heard of a product called "water bar" which i'am currently investigating.

thanks inadvance
brendan

peter_dublin

Quick and dirty fix is to use bitumen mastic about six euro a tube.

v240gltse

hi peter

excellent idea

thanks

brendan