Patio Roof

[dollybird]

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.

[journeyman Mick]

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

[ausdesign]

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.

[Purse]

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


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

[Bleedin Thumb]

Stop showing off Purse.

[dollybird]

Thankyou all so much for your replies.

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

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.

[Purse]

Glad to help

Cheers