I have a double-width garage. I presume that when they originally
built the property (about 8 years ago) they laid the concrete floor in
There's a crack developed more or less centrally between the two bays,
running about 80% of the distance front to back. The crack is nothing
serious (yet anyway), but I'm wondering whether it's something I ought
to be concerned about? If so, what should I be considering as my
Knowing how stingey builders are it wouldn't surprise me if they
short-changed the concrete in the garage floor and this crack is due
to settlement, bearing in mind that there's a car parked on one side
and not the other (we are a one car family).
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The car moves out during the day, and is immediately taken over by a
foldaway bench etc.
Now all I have to do is find a new home for the lawnmower and
childrens bikes (see other thread about garden shed purchase).
We strung the bicycles from the roof using pulleys purchased from a
chandlery. They can be a right pain to stow but this way they are
well out of the way. (The structure of the garage/workshop is gable
walls built up with multibeam purlins spanning between them. This give
an open roof space. Very useful)
Paul Mc Cann
I have a triple 8-)
It is, however, slightly filled by a hibernating Alfasud.
I'd expect most domestic double garage floors to crack. That's a wide
piece of concrete, and if it isn't unusually deep, then it's going to
shift. If you're lucky, then they'll have put a groove down it to make
a neat crack. If you're unlucky, then it's ragged and will start to
break up along the edge.
Personally I'd stick some bitumen down it and ignore it.
Since we're comparing sizes...
How big is it? We spent the weekend putting the roof on mine
(box profile), which is 8mx6m. Superb size, especially compared
to the single I had at our last house.
Now all I have to do is figure out how to insulate it for
Any short change or settlement would have presented itself much sooner
than 8 years.
It may be a natural shrinkage or movement caused by seasonal changes
in the ground or air moisture. Alternatively by constantly loading one
part of the floor with a car, this can cause uneven loading of the
slab and ground below leading to differential movement.
Unless the crack carries on getting bigger, damp starts to rise
through it, or similar movement occurs in adjacent walls then it can
be left alone - after all it is just a floor slab.
A cementeous grout, resin or even a polysulphide mastic can be used to
fill the crack if required. Alternastively cut out a proper movement
joint and fill with a flexible seal.
BTW, I find it curious how someone who knows "how stingey builders
are" can promote a handyman service involving building work.
On 25 Aug 2003 06:32:55 -0700, email@example.com (dg) wrote:
Sorry if I offended you, it wasn't intentional. However I've worked on
enough houses to know that when an estate goes up it isn't unusual for
the workmanship to be poor, or for mixes (etc) to be maladjusted. It
is possible that one reason for the crack appearing is that I have a
slightly heavier than normal car (Freelander), so if the concrete
floor was in any way "thin" then I guess that would explain why the
slab has moved causing this crack - it wouldn't take much short
changing of concrete on the part of the original groundworker for that
to become a possibility.
Advice I've received from several different places suggests that when
workmen are hired for these estate homes they are paid a basic flat
rate for the job. Simple logic will tell you that they ain't going to
waste any more time than they have to.
As an example, a couple of weeks ago one of the dual 13A sockets in
our home was playing up so I decided to fix it. Took the socket off
the wall to be met by an obvious bodge job by the electrician who
wired the house - the socket hadn't been off the wall since we moved
in. The earth ring wasn't complete because one of the two earth wires
wasn't made to the socket.
And for what it is worth - concrete isn't one of my deliverables.
I'm not offended, but it just came across that you were knocking
people in the area of work you were involved in - and therefore
I am involved in quality assurance of construction works, and it is
very easy to criticise work that one was not involved in. In this
instance was it the groundworker, his foreman, the site agent, the
concrete supplier, the designer, or the quantity surveyor that was
responsible for the thin concrete - or just normal wear and tear?
I have found that our clients and customers have more respect for the
operative that does not make specific comments of others work, but
rather give a balanced opinion based on the facts at hand.
I look for this too in those that work for us.
Ah, your problem is obviously the single car storage. It's creating uneven
stresses on the concrete... you garage is in danger.
Tell you what, I'll sell you a lovely Honda Prelude, that should balance the
problem out, and save the garage....
email me at
richard at olifant d-ot co do-t uk
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