₦airaland Forum

abdulwastecx:
here some general information and properties of hip roof ( German roof).
1.All the ridges and valleys (gutter) should be at 45 degree to the edge of the building
2.All the ridges and valleys (gutter) should be parallel to one another.
3. A reasonable spacing of 1.2m (4ft) should be adopted.

Miscellaneous:
Please in your number 3 rule, spacing between wat?

abdulwastecx:
Between the tie beam

Miscellaneous:
Sorry to disturb u on this again. Do u mean in actual construction? Because in the sketched roof plan , I cannot see tiebeam …… please help.

abdulwastecx:
step; Determination of roof height = highest king post
the highest king post is determine using simple ''hypotenuse theorem"
assume height =h
length of the longest side = L

solution, the opposite = h, adjacent = L/2
I wanted to use a vertical slope of 35degree ( because i wanted a simple and medium high roof)
h = L/2 x tan 35 = 19ft ( note , L/2 = 27'2'')

abdulwastecx:
here some general information and properties of hip roof ( German roof).
1.All the ridges and valleys (gutter) should be at 45 degree to the edge of the building
2.All the ridges and valleys (gutter) should be parallel to one another.
3. A reasonable spacing of 1.2m (4ft) should be adopted.

Porthos:
Seriously I need clarifications. You said the tie-beams were at 45° and now you made the king post has a vertical slope of 30° using hypotenuse theorem. Now, how? In hypotenuse theorem, ur h=opp=king post but wat made up ur L part of the eqn? rafter? how does the 45° of tiebeam comes to play? if the tiebeam is 45° how come u can get 35° again? Pls assist me……


I am studying civil engineering with little experience in field work and more of design study..... pls I really need ur careful explanations. Thanks

abdulwastecx:
You have to know the difference between plans and elevation when it come to roof design.

Let me explain it using a three dimensional coordinate system of : x, Y and z
X and Y been the plan and z been the height
The rafter run across the plan in x Y direction while the rafter is from plan x-y and z direction.

The tie beam ( bottom) cord for timber design are mostly spaced at 4ft or 1.2m center to center. At the conner of the house to the tie beam makes a 45 degree to the adjacent edges on the plan.

The king post is determined after all the rafter have been nailed or screwed into position. The height of King post depend on the slope of the roof

Porthos:
thanks a lot. It's beginning to make sense..... but is this statement of urs correct "
The rafter run across the plan in x Y direction while the rafter is from plan x-y and z direction.
" ………

ganiyu26:
Informative!

Miscellaneous:
Thanks very much. This statement really helped me think: "Shape of the roof is govern by shape of the floor plan, size of the plan"

abdulwastecx:
You have to know the difference between plans and elevation when it come to roof design.

Let me explain it using a three dimensional coordinate system of : x, Y and z
X and Y been the plan and z been the height
The rafter run across the plan in x Y direction while the rafter is from plan x-y and z direction.

The tie beam ( bottom) cord for timber design are mostly spaced at 4ft or 1.2m center to center. At the conner of the house to the tie beam makes a 45 degree to the adjacent edges on the plan.

The king post is determined after all the rafter have been nailed or screwed into position. The height of King post depend on the slope of the roof

nwaanambra1:
you must be very good in what u do. superbly clean roofing!


oya wey those Nairalanders that always ask "who all those maths wey them teach for school epp!" come and see the people that it epped!


bros! this project na for anambra shee? even if its not anambra am sure its in the east!

nwaanambra1:
you must be very good in what u do. superbly clean roofing!


oya wey those Nairalanders that always ask "who all those maths wey them teach for school epp!" come and see the people that it epped!


bros! this project na for anambra shee? even if its not anambra am sure its in the east!

Mrjo:
45 degree should hav been for rafters nt ridge and V. gutter, though the work itself didnt show that, well, i will like to work with u.

adulwastecx:
My oga na for anambra o. You know anambra is a very beautiful place na. It is in akpom village very close to onitsha.

abdulwastecx:
You are wrong sir, 45degree is for the ridge or Valley.
The angle of the rafter is govern by the high of the roof. Hope this sketch below help

Mrjo:
to achieve 45 in rafters the hight of king post will be the measurement of the width divid by 2 bt to get that in corner hip 3 quater of the width.

abdulwastecx:
step; Determination of roof height = highest king post
the highest king post is determine using simple ''hypotenuse theorem"
assume height =h
length of the longest side = L

solution, the opposite = h, adjacent = L/2
I wanted to use a vertical slope of 35degree ( because i wanted a simple and medium high roof)
h = L/2 x tan 35 = 19ft ( note , L/2 = 27'2'')

Chukazu:
but this is rather too high, more like a masquerade... I mean do you plan to rent the space in-between the roof to a tenant?

do we also consider maintenance, how can someone climb this is there is leakage?

abdulwastecx:
I'm here again to present to you my ideas on how to design and construct an economical and aesthetically pleasing roof in Nigeria.
for this topic, i will be using one of Harney projects ( podosci and abdulwastecx) ongoing project as a case study.
this thread will try to shed lights and educate prospective home owner on how to choose floor plan design that will be pleasing in the eye, economical and will be durable over a long period of time.

case study one: construction of timber roof truss for a confidential nairalander
contractor : harney projects
Duration of roof work : nine days (including two Sundays)
Location : confidential

uwakwesab:
your are doing well my Engr. from the same family house in RCCF Rivers. still hoping to understudy you in time to come bro