Last time we drew the basic cabin section and today we will add the porch. We will start with the building section we completed in Part 10.
As always, we will start with what we know:
- The posts are 6″ square
- The porch is 8 ft wide
- We will set the beam height to 6′-8″ to the bottom.
- The porch roof pitch will be 4:12 (1:3 ratio)
- The porch floor thickness will be 8″ (2 x 8 floor joists)
- The porch roof thickness will be 6″ (2×6 rafters)
- And the roof overhang will be 1′-0″
Some of these assumptions will need testing, but for now that is where we will begin. And remember, we are completing this section for the purpose of finding the heights needed to draw the elevations (exterior views).
Follow along with the section drawing below (figure 1) as I take you through the order in which I normally construct the building section.
First we will draw the porch floor line (#1).
This will be the base line for all that comes next. Draw this horizontal line 3″ below the cabin floor line.
Next draw the outside of the porch posts. (#2)
This vertical line will be 8′-0″ from the outside wall of the cabin.
Draw the post thickness next. (#3).
We know that the posts are 6″ square, which would be 1/8″ on the graph paper.
Next we will draw the bottom and top of the beam. (#4).
Draw a horizontal line 6′-8″ above the porch floor line (#4a), that will be the bottom of the beam. Draw another line 8″ above this line (#4b)… that will be the top of the beam.
The porch roof pitch comes next. (#5).
This line is drawn beginning at the top of the beam on the inside face. The inside face of the post is where the rafter will sit and represents the inside face of the roof. Draw this line at a 1:3 slope . I usually so this by measuring over 12ft (in scale) and then up 4ft and connecting the two points.
Now draw the floor thickness. (#6).
Since we will be using 2 x 8 floor joists, draw a horizontal line 8″ below the porch floor line.
The roof thickness comes next. (#7).
In a similar manner as we did for the floor thickness, draw parallel lines 6″ above the inside roof line you drew in #5. This line will represent the outside of the roof.
Next draw the roof overhang. (#8).
Draw a vertical line 1′-0″ (to scale… 3/8″) outside of the post line. This will be the roof overhang and will determine the gutter or eave height for the elevations.
Last draw the grade line. (#9).
Draw a horizontal line 8″ below the cabin floor. This will be the ground or grade.
Now finally darken in all the structure that you have just outlined (figure 2 below).
So now you have all the information you need to draw the elevations. Next time we will draw the end elevations.
As always, your comments are very valuable not only to me but to the others who drop by.