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# Roofing/Calculation

Question

Roofing
QUESTION: Hello
With reference to the following details for my proposed roof plan  attached, can assist me with sketching and computing the following below for my roof.

Details:
Drawn to a scale 1/8"=1' and with an overhang of 3'can you assist me with sketching a hip roof for a 4/12 slope or a 1/6 pitch and computing the following:
1. common rafter length
2. hip rafter length
3. jack rafter length
4. number of galvanize sheets
5. also how much labor and how much/type materials would be required

There are various methods and ways that you could design the roof and it's really up to you how you want to design it. You should design the roof the way that you want and then you can proceed. With regard to the calculations you can visit http://www.roofingcalculator.org/roof-pitch-calculator.php for various lengths once you design the roof. You should review the building codes in your area (I'm in the US and only familiar with US/Canada codes) to see what requirements they have. With regard to the cost for the roofing and materials I would recommend that you contact local contractors for the actual pricing for an accurate quote.
I'm sorry that I can't provide much help, but there are too many variables for me to accurately answer the questions that you've asked.
Good luck,
Aaron

---------- FOLLOW-UP ----------

QUESTION: Thanks!
Also, is there a formula to calculate galvanize sheets and how?
Wanted to find out as well what is the difference among hip rafter, common rafter and jack rafter

Sam,
I'm assuming that you mean galvanized sheets for the actual metal roofing? If so you can get them is various lengths and widths so I couldn't tell you how many you would need as they are different sizes.
With regard to the different rafter types - here http://www.bing.com/images/search?q=jack+rafter&id=1D20D079E49F66A9DFA7403EBB96F is a link to a good photo showing various types of rafters.
Aaron

#### Aaron Nelson

##### Expertise

All types of questions with regard to roofing, waterproofing and sheet metal. This includes commercial and residential buildings, along with the various aspects of the construction means and methods, ventilation, steep-slope or low-slope, code requirements, installation errors and other such problems

##### Experience

I started in roofing fabricating and installing sheet metal flashings out of high school for a large commercial contractor. I worked for the same contractor in the office estimating and project managing commercial project for 10 years. I left the construction side of roofing and now work as a roof consultant, which I have been doing for 8-years.

Organizations
RCI, Inc.

Education/Credentials
I am a Registered Roof Consultant (RRC) and a Registered Roof Observer (RRO) through RCI, Inc. RCI is a international group of building envelope professionals. I am an approved instructor for RCI educational programs.

Past/Present Clients
We have worked with many local school districts, insurance companies, HOA's, building management companies, and we have a national client with buildings located throughout the US.