scales for construction

Level 3 Diploma in Plastering

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PowerPoint presentation

Construction drawings

Unit 315: Producing and fixing detailed fibrous plaster and cement casts



Assessment criteria1.1 Purpose of detailed specifications

1.2 Describe different types of detailed drawings



DrawingsThis PowerPoint presentation will look at different types of drawings.



Block plan site plan



General location drawingsGeneral location drawings are usually produced to a scale of 1:200, 1:100 and 1:50. They show positions occupied within the building and locate the principal elements and components.

Assembly drawings, which show the various components fit together in the building, are usually to a scale of 1:20, 1:10 or 1:5.

Detail drawings show all the information that is required to manufacture a particular component. These are produced at a scale of 1:10 and 1:5.



DimensionsDimensions are shown on drawings against a lightly drawn line with arrowheads terminating against short cross lines.

Actual sizes may be shown individually as separate dimensions or cumulatively along a building, as in running dimensions.

Running dimensions are preferred for setting out rather than separate dimensions, since any inaccuracies or errors made in each separate dimension will have a cumulative effect, throwing each succession position out.

Where running dimensions are not shown on a drawing, it is best to work them out and indicate against each position. As a check, the total of the separate dimensions should equal the final position figure.



General location drawingsThese include block plans, site plans and elevations.

Site plans show bricklayers the lengths of walls and the overall view from above the proposed build.



Block planBlock plans show how a bricklayer would read the location of the site, adjoining roads and boundary lines.

It is common practice to highlight the working area in a different colour to make it clearer.

An advantage of this is a bird’s eye view of the site and its boundaries.



Elevations



ElevationsElevations show views of the buildings from the front, rear and side.



Sections



Sections (cont)



Drawing layout



Drawing projections



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