Patio Roof

Hi guys, this is my very very first post on here - and i hope to keep posting if you guys dont mind - unfortunately i cant provide advice but I would like to receive some. I am from Perth, Western Australia.

Firstly I would appreciate any replies in basic english - not too technical please.

OK our patio is going to be 5.6 m wide with a gable roof. Now the triangle bit will be attached from the house going outwards 4 metres. Gee I hope this makes sense. So there will be another triangle bit 4 metres out from the house. Now I would like to know how high the point of the triangle should be from the flat edge (roofline I guess). I have been recommended 70 cms.

Your advice is much appreciated if you can understand what I am asking.

Thank so much.

Dollybird,
unfortunately technical jargon is often required rather than plain English to identify precisely what is being discussed. Unfortunately, in the case of your enquiry I can't make out what you are referring to (lack of technical terminology, ie "triangle bit";) ) Unless you want to get a text book in order to use the correct terminology you might be best off to make a drawing, scan it in and post it here.

Mick

As Mick said Dollybird - a picture or sketch will speak a thousand words or is that a hundred.
What is the slope of the house roof & are you going to try & match the patio roof slope to it or make it completely different ?
Sometimes if the slopes are close, but there is a slight noticable difference it can look like . . . what's the word . . . an error.
If I get what you're describing with the pointy bit up 700mm ( 70cm is for dressmaking ;) ) then the pitch will be around 19 degrees. Whether this will look ok has to be taken in context with the existing layout.
Hope this helps.

Sounds to me like he is asking about the height of the gable. If this is the case, the standard pitch is 22.5 degrees. So using a bit of Trig you should be able to work out the height of the gable.

So for 4m wide gable the calculation is:

(half the span) x Tan (angle)
2m x TAN 22.5 = 82.8cm

Or for a 5.6m wide gable
2.8m x TAN 22.5 = 115cm

You can also work out the length of each side of the gable by using:

(half the span) x COS (angle)

For 4m wide gable:
2m x COS 22.5 = 1.84m

for 5.6m wide gable:
2.8m x COS 22.5 = 2.58m

Hope this helps :o


You can also work backwards if you have a height you want to use with the inverse of TAN:

inv Tan ( height/half span)

So for 4m gable width and height of 0.7m
inv TAN(0.7/2) = 19.3 degrees

and for 5.6m gable width and height of 0.7m
inv TAN(0.7/2.8) = 14 degrees

The diagram should show what dimensions im talking about



Cheers
Purse

Stop showing off Purse.;) :)

Thankyou all so much for your replies.

Purse - you are spot on - nice to see a man who can read a womens mind :p .

I never was too good at tangents etc - didnt really think it would come in handy for anything - guess I was wrong.

So are you saying the height in the middle should be 1.15m. As you mentioned the gable will be 5.6 metres wide.

Top guy - thanks so much.

Glad to help ;)

Cheers