Joiner
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Sorry about the gap in transmission, a Skype call came in from a mate that I had to answer.
From the way you describe your needs Andrew, it sounds as if the most basic form of porch would do you - and without a single joint, too.
Obviously a dwarf wall would give the best 'foundation' for the rest of it, but it won't be necessary to go the whole hog and provide foundations for that wall, just tie it back to the house with ties and, if you've got a concrete path outside already, just lay the bricks directly onto that. The footprint of the porch is up to you.
Fix a wall plate along the top of the dwarf wall. Mark off the height of the porch eaves. Screw (use conscrews throughout) vertical posts into the brickwork to this height. Measure the size of the square thus created and make a wooden square frame with the same outside dimensions as the dwarf wall. Fix vertical posts to the ends of the dwarf wall to create the door frame to the height of the eaves (and if you've 'turned the corner' fix posts to these corners using brackets). Fix that square framework onto these posts by just screwing through, fixing the rear of that frame back to the house. As a belts and braces measure, check for squareness across the diagonals and fix temporary cross pieces from each rear corner to the centre of the front horizontal piece. If you want a lean-to type roof then just follow your diy instincts, aiming for an angle of about 40 degrees, but one which looks right according to the 'depth' of the porch.
If you want an apex roof, cut a ridge board equal to the depth of the porch plus about 2 or 3 inches (if you're gonna tile it, then to save assing about make the ridge board equal to an equal number of tile widths) to give you some weather clearance. Mark off the overall height to the top of the intended ridge height (and mark its centre line) and measure from there down to the outside edge of the top wall plate, adding about six inches to give you a good throw off for the rain (unless you're guttering it) at the eaves. This will give you the length of the joists. Cut the joists and hold one in place against the back wall aligned with the marks and mark off the angle cut on the joist, which will be the same both ends. Transfer that angle to all the other joists.
Ideally you should birdsmouth the joists onto the wall plate and you can get its outline by sitting an offcut of the section you used for the top frame on top of the top frame and holding the joist parallel with the mark on the wall and the edge of the top frame so that the offcut, when pushed against the joist, gives you about an inch 'penetration' into the side of the joist. Mark that cut, cut it out and use it to mark off all the other joists. (You will have needed to move those bracing pieces to locate the joist against the wall.)
If you now position the joists and screw through the birdsmouth into the top frame (again using those incredibly powerful conscrews), fixing the back and front joist first, you can push the ridge board up between the joists where it will be held in place by friction. Screw through the joists fixing them to the ridge board. Repeat for all all other joists. Replace that temporary bracing with more permanent sections, which will be hidden when you fix the 'ceiling' in place and board in the front of the porch roof.
You've now got your basic framework up. Just the door, the walls and the roof to sort. (Me? I'm going for a coffee and a sit down. I am supposed to be on holiday, after all.)
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