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How To Make a Slanted Roof by Cornrow Wallace
Your first step, assuming you already have your house built, is to determine where the halfway point is. To check this, switch to your XZ Front view (ctrl+Tab) in the 2d grid, and select the front wall of your building.
My building in this example is 448 units wide, so my halfway point is 224. Draw out a brush from the top left side of the building, make it as long as your halfway point. So for my building, I'll draw out a brush that is 224 units wide, the height doesn't matter at this point.
Now, with that brush still selected, hit the E key to enable the Drag Edges function. What you want to do here is grab the top right blue dot and drag it up to where you want the point of your roof to be. After that is in place, do the same with the bottom right blue dot, the space you leave between both dots will be the thickness of your roof, which all depends on how you want it. Do not adjust the middle blue dot.
Sidenote: Remember to adjust the left side of this brush as well, leaving the same amount of space between the dots on the left, or your roof will not be even. Also make sure you keep the two points perfectly in line, you want the angle you're making to be straight so another piece can line up flush.
If you want the roof to overhang the walls, simply drag it on the desired side.
Now, switch to your XY Top view in your 2d grid (ctrl+Tab). Here you want to make sure your roof covers the entire side. You can also hang it over the front & back of the building if you like.
That's a bit confusing at first glance, but the brush that is closest to the actor is the building, the other obviously being the half roof. Play around with adjusting the roof, it will make sense eventually.
Next step is to duplicate the half roof we already have. So switch back to your XZ Front view (Ctrl+Tab) and select your half roof. Press the Spacebar to duplicate it. Now hit the z-Axis Rotate button twice (8th button from the left at the top, or Selection > Rotate > Z Axis twice).
After doing that, you'll have to move the new half to the right side, lining it up flush with the other half.
So now you have a slanted roof. But, there are still two parts missing. There is a big space between the inside peak of the roof, and the top of the building. This is quite simple to achive.
Find the point where the top left side of your building and the roof meet. Draw out a brush that starts there and continues to the other side, where the top right of the building & the other side of the roof meet. Bring this brush up to the inside peak of the roof.
Before we continue, switch to your XY Top view in your 2d grid (ctrl+Tab). Make sure this new brush is the same width (or thickness) as the wall it is sitting on. Also make sure it lines up with the wall it is sitting on.
So now, switch back to the XZ Front view in your 2d grid (Ctrl+Tab). Zoom in a bit so you have a closer view, but keep the bottom left corner of the new brush & the inside peak of the roof in clear view. Press the X key to enable the Clipper tool. Left click once on the bottom left corner of the new brush, and a second time on the inside peak of the roof.
This action just split the brush into two pieces. Now hold down the Shift key and press Enter once. Now both brushes are visible again, but you will notice it split in the exact path of your roof.
Now, do the same to the other side.
Now, in your 3d view deselect (hold the Shiftkey and left click once) the triangle you created in the middle, leaving both outside brushes selected.
Press Backspace once to delete them both. And now you have filled the area with a perfectly fitting triangle.
Now you need another triangle at the opposite end of your building. Select the triangle in your 3d view, and switch back to your XY Top view in your 2d grid (ctrl+Tab). Press the Spacebar once to duplicate it, and drag it to the opposite end. Same rules apply: make sure it's even with the wall it's sitting on.
And that's that, you have a slanted roof that is perfectly sealed off.
Sidenote: This just took me about an hour to do, so you better appreciate this!!
Good luck.
