I'm considering building a wooden frame for a felted apex roof to put
over my leaking concrete flat-roof. What's the best ways of going about
it? Where could I find some plans?

tia

--
Simon

12) The Second Rule of Expectations
An EXPECTATION is a Premeditated resentment.

usenet2012 wrote

I'm considering building a wooden frame for a felted apex roof to put over
my leaking concrete flat-roof.

Why wouldn't it be better to just do another flat one on top of the existing
one ?

Very easy to do with metal decking too.

What's the best ways of going about it? Where could I find some plans?

In message , Rod Speed
writes
usenet2012 wrote

I'm considering building a wooden frame for a felted apex roof to put
over my leaking concrete flat-roof.

Why wouldn't it be better to just do another flat one on top of the
existing one ?

That's been done several times in the past by others and has lasted
little time.

Very easy to do with metal decking too.

The space is unusable for decking and doing this would reduce further
its potential as an access route to the property.

What's the best ways of going about it? Where could I find some plans?


--
Simon

12) The Second Rule of Expectations
An EXPECTATION is a Premeditated resentment.

On 26/02/2013 08:34, usenet2012 wrote:

What's the best ways of going about it? Where could I find some plans?

A ---- Can you use that as a plan?

Seriously, I think that your biggest issue is making sure that the new
roof is sealed round the edges, so as to keep the rain out and is
adequately ventilated. That's assuming there is a parapet round the flat
roof. If no parapet, just make sure there are adequate eaves with guttering.

I detest flat roofs. They are never built with enough slope to ensure
that the water runs off, rather than pools. I have no idea why not.

In message , GB
writes
On 26/02/2013 08:34, usenet2012 wrote:

What's the best ways of going about it? Where could I find some plans?

A ---- Can you use that as a plan?

LoL. I think I need a just leettle more detail about the joints...

Seriously, I think that your biggest issue is making sure that the new
roof is sealed round the edges, so as to keep the rain out and is
adequately ventilated. That's assuming there is a parapet round the
flat roof. If no parapet, just make sure there are adequate eaves with
guttering.

The existing damned thing is made of re-enforced stony cracking concrete
- spit! It does have overhangs on all four edges though so I'm thinking
I'd build an underhanging overlap (IYSWIM) to secure it. Ventilation -
to stop the timber rotting under the felt? Hmmm, vents at the (errrm)
gable ends?

I detest flat roofs. They are never built with enough slope to ensure
that the water runs off, rather than pools. I have no idea why not.

This was built with no slope at all. Superb!

--
Simon

12) The Second Rule of Expectations
An EXPECTATION is a Premeditated resentment.

usenet2012 wrote
Rod Speed wrote
usenet2012 wrote

I'm considering building a wooden frame for a felted
apex roof to put over my leaking concrete flat-roof.

Why wouldn't it be better to just do another
flat one on top of the existing one ?

That's been done several times in the
past by others and has lasted little time.

There is no reason why it can't be done properly this time.

Very easy to do with metal decking too.

The space is unusable for decking

Why, when you can do an apex roof ?

and doing this would reduce further its
potential as an access route to the property.

Why is a felted apex roof any better ?

What's the best ways of going about it?
Where could I find some plans?

GB wrote
usenet2012 wrote

What's the best ways of going about it? Where could I find some plans?

A ---- Can you use that as a plan?

Seriously, I think that your biggest issue is making sure that the new
roof is sealed round the edges, so as to keep the rain out and is
adequately ventilated. That's assuming there is a parapet round the flat
roof. If no parapet, just make sure there are adequate eaves with
guttering.

I detest flat roofs. They are never built with enough slope to ensure that
the water runs off, rather than pools.

Doesn't pool on my metal decking roof.

I have no idea why not.

On Feb 26, 6:35*am, usenet2012 wrote:
I'm considering building a wooden frame for a felted apex roof to put
over my leaking concrete flat-roof. What's the best ways of going about
it? Where could I find some plans?

tia


The quickest and easiest is to use roof trusses.
You will likely find a standard size will fit. If not, they will make
one up for you.
All you need to decide is what tiles you are using (hence weight/sq
metre) and they will tell you what distance to put them apart.

On Tue, 26 Feb 2013 02:23:04 -0800 (PST), harry wrote:

I'm considering building a wooden frame for a felted apex roof to put
over my leaking concrete flat-roof.

All you need to decide is what tiles you are using (hence weight/sq
metre) and they will tell you what distance to put them apart.

Read what is written...

I'm wondering why this has to be an apex roof, what's wrong with a "flat"
roof constructed with a decent fall and covered with GRP or even felt as
the OP wants to use felt for some reason. Felt will fail on an apex roof
just as well as it will fail on a flat roof...

Be a lot simpler and easier to build a flat roof than an apex one. Joists
lifted a inch or so above the existing roof, firing pieces attached to
top, or different sized spaces underneath to get the fall, covered in 18
mm OSB3 and Bob is your fathers brother.

--
Cheers
Dave.

On 26/02/2013 06:35, usenet2012 wrote:

I'm considering building a wooden frame for a felted apex roof to put
over my leaking concrete flat-roof. What's the best ways of going about
it? Where could I find some plans?

Fix a down a 4x2 or similar "plate" along the two wide edges.

Decide what kind of angles and overhangs etc you want (20 deg looks ok
for a felted roof IMHO), and make a pair of rafters up to check. Cut
birds mouth joints in the eves ends to sit on the wall plate. Allow for
a ridge beam between them at the other end.

If that looks ok, use one as a pattern to make as many as you need.
Nail/screw em all together. Fit a few A frame style restraining joists
across the span (does not need to be every pair). Then board and felt
away... (a couple of layers of torch on modified bitumen felt does a
nice job - 2mm underlay and 4mm mineral finish cap sheet)




--
Cheers,

John.

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In message , John
Rumm writes
On 26/02/2013 06:35, usenet2012 wrote:

I'm considering building a wooden frame for a felted apex roof to put
over my leaking concrete flat-roof. What's the best ways of going about
it? Where could I find some plans?

Fix a down a 4x2 or similar "plate" along the two wide edges.

Decide what kind of angles and overhangs etc you want (20 deg looks ok
for a felted roof IMHO), and make a pair of rafters up to check. Cut
birds mouth joints in the eves ends to sit on the wall plate. Allow for
a ridge beam between them at the other end.

If that looks ok, use one as a pattern to make as many as you need.
Nail/screw em all together. Fit a few A frame style restraining joists
across the span (does not need to be every pair). Then board and felt
away... (a couple of layers of torch on modified bitumen felt does a
nice job - 2mm underlay and 4mm mineral finish cap sheet)

Thanks John.

--
Simon

12) The Second Rule of Expectations
An EXPECTATION is a Premeditated resentment.