Monday, October 21, 2013
C. 1825 workman's cottage, north of Boston
Today a park has replaced the factory. The house is in-town. Over the years wings have been added on 3 sides. I have cropped the photograph in order to focus on the original house.
The post and beam frame includes recycled beams. 2 have beaded edges - probably recycled from the best room of a pre-1760 house.
Here is its section - a slice through the house showing its basic layout.
Here is the 3-4-5 triangle used to determine the size and location of the walls, the pitch (angle) of the roof
Here is the 3-4-5 triangle used to locate the 2nd floor joists and the ceiling joists.
The dot and dash triangle determines the height of the collar ties (ceiling joists). Its
vertical leg crosses the first triangle at the location of the second floor. The second floor window locations are also set by this line.
All this also makes me think that the house frame was laid out in the traditional way, on a flat space called a framing yard and then dismantled and re-erected on site. Contractors lay out rafters in this same way today as they frame a roof. They use the floor of the house just below the roof as their framing yard.
Here is the floor plan. I've noted the chimneys. The lathe and plaster box around the lower one includes modern plumbing, heating and electrical systems.
And here is how the 3-4-5 triangle was used to layout the floor plan. Just as the exterior sills and walls were placed inside the box determined by the triangle, so the beams on either side of the stair were placed inside the box. The walls, set above the beams, are on the inside edge.
The chimney locations are set by the triangle, but the windows on the opposite wall are not. They are centered on the rooms.
The windows on the side walls are located by a square - in green - based on the shortest leg of the triangle.
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