Raising the (workshop) roof?

[T i m]

Hi All,

I have a question re of those pre cast concrete garages, (10' x 20' and 8' at the eves) and I noted we have some garage construction experts on this group. ;-)

The current pitched corrugated cement fibre roof is fairly low angle and I was considering raising the angle to provide more space up there (ideally to store a 16' Canadian canoe, possibly fed in via a door in the front gable .. like the access to a barn loft etc).

I would prefabricate the steel frames and gables then hopefully remove / replace the entire thing one dry day (I should be able to do it a couple of panels at a time, depending on the lengths of the purlins).

The existing moulded apex sections have a fairly low angle and wondered if they made alternative angles and if what options would I have please (I would imagine they do but my Googling has come up with little so far).

Depending on that I would have to check back to ensure it stayed within the 'permitted development' for maximum height (I think it was

4m or similar for that shape roof).

I guess unless the new apex pieces had very long sides I might have to also buy new roof panels and they would then be to short. :-(

Are there any other considerations I may have missed please?

All the best ..

T i m

[geoff]

In message , T i m writes

Probably a fairly major undertaking if you are not familiar with them, but quite doable

What make is it ?

e.g. Banbury and Compton use quite different construction techniques

You would Have to renew the roofing sheets, the old ones will probably be very brittle, the holes not in the correct place and, yes, too short

Screws and clips will probably be well rusted as well

Is the front gable not concrete? You would have to remake F & B out of wood

[T i m]

Well I was with the guys when they assembled it and it all looked fairly straight forward (luckily I had provided them a very flat / true base to work from and they seemed grateful for that (that and plenty of tea and a Pizza for lunch ). I had them assemble it rather than doing it myself as I wouldn't have been covered for any panels / sheets that broke during construction etc. Plus, it would have been a pretty heavy job (8' eves).

Sturdy I think Geoff (it was about 15 years ago now).

Possibly. The bits inside still look ok.

Tongue / groove wood. I was thinking of replacing them with waterproof ply (noise / insulation), skinned with gavl steel (for some security) and plastic cladding (for looks).

My outstanding question is still the ridge pieces. The existing ones [1] are set at a fairly shallow angle and I don't know if there are others of greater angles or if you imply use a different technique (like a traditional clay ridge tile bedded on cement)?

All the best ..

T i m

[1] In case what I have isn't 'typical' the ridge pieces consist of pre moulded sections that are ridge and a small lengths of roof panel section type shoulders in one, probably something like 30" wide (from memory). i.e. They overlap the top of the roof panels by maybe 6-9".

[geoff]

A level base is absolutely critical for a good construction

That said, we built some where the front posts were on two bricks (having a) got a waiver and b) a bit of extra in the back pocket for the extra work

Prolly sensible, they would know how to go about it and know the work arounds when a problem came up

It's all technique, two of us would put up three in a day

Not one I know

I was going to mention that, then the wife came back from her dance class, ... and I forgot

the best workaround I could think of would be to pack the space out with a mortar fillet

[T i m]

Wow.

I think these are them Geoff ..

looks like the pebble-dashed double with white doors (but is only a single).

Doh!

Ok, so I have this straight (and this might account for the lack of replies) ...

On my existing garage roof the ridge tile (as you would call it on a tile / slate / roof / hip) is actually moulded out of the same cement fibre as the roof sheets. It covers the width of a ridge tile and a good 12" either side of the roof (like a sombrero) and is set at the same angle as the pitched roof. It is bolted down in the same way the roofing panels are.

I was assuming these might be available in a range of angles but maybe that's not the case and if I was to move up to a steeper pitch I may have to go back to a more traditional mortar beded ridge tile of some sort (or I could use a hip tile if the angle wasn't that much)?

I must admit I like the existing setup as there is no mortar to apply and crack up.

Hmm, maybe I need to re-think this .. :-(

All the best ..

T i m

[geoff]

Same basic design as Compton

Why would they do more than one angle ?

I would think that they would have just one standard pitch of roof

you might find them at a building suppliers

[T i m]

I think it's the same basic design as many pre-fab garages Geoff but the bit that interested me was the especially tall eve height (more space for racking and motorbikes on lifts etc) ;-)

Because they often also do 'Deluxe garages with higher roof angles but they also seem to use either 'tile look' corrugated steel sheets [1] or real tiled / slated construction (and therefore using traditional building techniques).

I guess I could also use some sort of a galvanized metal ridge (do they make such a thing)?

All the best ..

T i m

[1] I should image they would be quite noisy but I was thinking of lining this new roof with some form of thermal insulation and that might help with noise (in and out) as well?

[geoff]

You'd be surprised, there are a number of different constructions

[Appin]

The message from T i m contains these words:

Yes, of course they do. Bend to shape! :-)

Some asbestos-cement ridgings are actually made up of two overlapping pieces so will handle a wide range of angles.

[geoff]

In message , T i m writes

Doh - stupid or what, I've just realised - you have an identical twin brother who posts in UKRM