Office: 01992 464131
We repair replace and renew all types of roof flashing, the most common method of roof
flashing covers now days is Lead, Lead flashing will protect well abutments from water ingress but first and for most the
Lead flashing must be correctly installed. Below are a few pictures of the Thousands of flashing repairs we have carried
out over our 35 years in business. Before Lead flashing were used it would have been common to use cement fillets, this
method was and still is fine on older listed properties from tudor time etc, the problems came in later years as heavy concrete
tiles became more common and the load on the roof became greater causing movement which intern pulled the fillet away from
the wall allowing water in and often people have patched these cracks up for a quick short term fix. The only long term
repair is to fix lead flashing to the wall which is more often than not stepped lead flashing. The old cement fillet
will need removing and tiles broken replaced, all joints between brickwork will need to be chased out, code 4 Lead will be
cut into Lengths to allow expansion and contraction to prevent the Lead from splitting over time. Next is to bend the upstands
leaving a 100mm tile covering, this Lead will now be placed ageing the brickwork marked and all steps cut out and bent to
shape. The Lead flashing will now be fixed into brickwork and dressed to shape. Pointing the Lead is the final job and
we always use a strong 3/1 mix and wet the chased out joint to prevent the mortar drying out to quickly which will compromise
the pointing strength if this happens. With all this carried out correctly our customers can be assured that there Lead
flashing will last or outlast the roof, please view roof and flashing pictures below and call or email if you require
a free quote and advice on any roofing flashing or any of the other services we offer.
Roof Valleys: Roof valleys are another common problem with roof leaks, the roof valley
is a point where two roof slopes meet like a dorma or an angle in the building which could be an extension etc.
again roof valley's are made of many materials Lead, Zinc, Copper, Felt, Fibreglass and I'm sure many more.
The best quality roof valley is always thought to be Lead because of its long life and durrability but the main draw back
is cost and if there are lots of valley's to be installed like a building site Fibreglass or Zinc are often used.
I alway recommend to my customers when we are installing a new roof not to skimp on this area of the roof and go for
the Lead because being a colletive place the valley where water collects it can be a nasty problem if it leaks in the future
and needs replacing. Replacing roof valley's is more difficult with slate roof's as the slates are nailed and
we need to use a special tool to free the slates to get the old valley out and fit the new valley, once the new valley is
fitted the slates are re-fitted and clip in place. With tiled valley's the tiles can be lifted and the valley replacement
carried out, when the tiles are relays and cut to the valley if needed it will require cement to be pointed between the valley
and tile to seal the gap and again this should be a strong 3/1 mix.
|Roof and Roof Flashing Replacement
|Roof Flashing Repairs
LEAD FLAT ROOF: Many bay roofs, small dorma's and gutter
valleys us Lead, mainly these roofs are on public building or are listed, due to the expense many private properties opted
for the more cost effective and practical option of high performance felts, Lead roofs will give a very long life span
but has to be weighed up against the cost etc.
|None Theft Lead Like
Roof flashings are one of the main causes of roof leaks, the job of roof flashings are
to form a sealed bridge between two abutments ie Roof and Wall, this can be parapits walls, dormas, roof window, flat roofs,
chimney stacks and many more. One of the most common cause of a roof leaks is when these flashings break down which
can be caused by many factors.
Cement fillets, dentals and Lead Flashings: cement fillets are still on many properties and can form a good seal but the problem now days is with heated
homes and shrinking timbers which cause movement in the roof which will lead to roof movement causing the dentals and fillets
to move away from the party wall. Many years ago this was not a problem and the roof would be layed to the wall abutment and
a cement fillet would be tilted at a 45 degree angle to roof and wall, this would often have tiled coloured dentals layed
into in to make the same colour as the roof. This type of seal would work very well until the roof moved which
would then crack the fillet away from the parapit, chimney stack etc and cause water to penitrate down the wall and into the
property. This problem with roof fillets has been overcome by the introduction of of roof flashings, although roof flashings
are mainly Lead there are also Zinc flashing, fibreglass flashing, felt flashing and probably more which I haven't used.
The Lead flashing type is by far the most popular choice but of recent time with the high price of metal and the possibility
of theft other materails have started to be used like fibreglass etc. The main benifit of a roof flash is
that it is attached to the wall but not the roof allowing the roof to move without breaking the flashings. Slate flashings
and flat tile flashings employ the help of soakers, these soakers are layed on each tile or slate as the roof is layed to
stop water traveling down the back of the slate or tile as it travels down the roof. The the cover flashing is installed,
this is chased into the wall either straight or stepped into the brickwork, they both offer the same protection but
if the brickwork will allow stepped flashing look far nicer and more traditional and is the one I enjoy doing most as it is
nice to admire your work, Instalation of these is by first chasing out either with a grinder if straight or by hand if stepped.
Normally for this 6" or 7" Lead would be used which would be cut into 4ft length then cut to steps and each step
bent to go into brickwork joint by min 1 inch, this is then Lead clipped or nailed if possible, dressed to wall and pointed
with a strong 3/1 mix.
With high metal prices the theft of Lead flashings has become common place, with alternative Lead the fact that the materials
used have no scrap value make it very practical for places of easy access, often the value of the lead is not the problem
to the property owner but the damage it causes and the labour replacement costs are. Alternative Lead is not cheaper
at the outset than real Lead flashings but give that is has no scrap value it has no attraction to the would be theft making
it a very attractive viable option for Lead flashing replacements and renewals. The alternative Lead acts and works
in the same way conventional lead flashings work and can be installed in the same time giving the same appearance as lead
roof flashing, it can be cut for stepped and straight flashings just the same as lead flashings and can be used for all flashing
|Lead Roof Replacement
Today with sky high metal prices Lead theft has become very popular, although
it is imposible to completely protect against this type of theft it can be made more difficult with certain measures,
below is The Campus Church in Welwyn Garden City that was the target of Lead theft durring the summer where the Lead flashings
where taken from the dormas.