There are many methods, but the first one that comes to mind is "murarsnöre" along both sides of the house and the patio....since I have it at home and know where it is ;-)
Another method that resembles what Droyna links to is to measure out from each corner of the house and then cross-measure from the corners of the house to the outer corners of the patio.
Measure 3m along the wall towards the corner.
Measure 4m out from that corner.
Measure 5m from the last measurement towards the wall and the point where you started measuring 3m.
When the measurements are correct, you have a right angle corner between the 3m and 4m stretches.
Another method that resembles what Droynas links to is to measure out from each corner of the house and then cross-measure from the corners of the house to the outer corners of the deck.
And how do I know that the outer corners of the deck are in line with the house?
And how do I know that the outer corners of the deck are in line with the house?
If you first measure say 3m out from the wall at both ends of the intended deck, then measure from one outer point to the beginning of the other measuring point and then vice versa.
When you have the same measure in the criss-cross measurement, it is perpendicular/in line.
If the walls of the house are 90 degrees, cross measurement will work, i.e., the diagonals from the house to the outer corner of the deck should be equal, and if the corners of the house are not 90 degrees, you will have to stick to strings that you stretch along the walls and to the outer corners of the deck.
When the yellow ones, which go from the inner point of one green to the outer of the other, are of equal length, it is perpendicular, provided that the green ones are of equal length. 😉
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When the yellow lines, which go from the inner point of one green to the outer of the other, are of equal length, it is perpendicular, provided that the green lines are of equal length. 😉
Okay, but how do I make it perpendicular AND as wide as the house?
FredrikR said:
