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Since Blender doesn't create new edges when 2 faces intersect I wonder how can do this: I have a roof on both sides of my house but i want to join the top faces of the roof together at the center. See the red arrows. How

Join a rooftop

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In Edit Mode select a vertex, snap a cursor to it (Shift+S-->Cursor to Selected) and change the transformation orientation type to Local. Enable the Snaping Tool (click the 'magnet' icon and change its type to Vertex). Press G and then choose the axis (press X, Y or Z, depending on your situation) twice and move a mouse cursor until it snaps to other vertex. Then select the whole mesh (A) and hit W-->Remove Doubles. enter image description here

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In my opinion, the fastest way is using F2 add-on: http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Modeling/F2

Install and activate the addon enter image description here

Select the vertex opposite to the "missing" one: enter image description here

Move the mouse near the "missing" vertex (don't click any button)

Press f

enter image description here

More info on the F2 Addon:

Quad from vertex.

When a single vertex is selected, a new quad is created by creating a new vertex. The position of this new vertex is calculated based on the three existing vertices. These are the selected vertex, and two vertices to which it is connected via open edges. An open edge is an edge which is only part of one face, or none at all. The newly created quad has the same material and normal direction as the neighbouring faces.

Quad from edge.

Similar to the quad from vertex functionality, this is based on open edges. The selected edge has to be connected to two open edges. The vertices which belong to these edges are used to create a new quad.

Direction control.

If there are multiple ways to create a new quad, the position of the mouse cursor is taken into account. Of the multiple new faces which are possible, the one which will be closest to the mouse cursor (in 2d screen-space) is the one which will be created.

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  • $\begingroup$ The addon will speed up mesh creation. It recognize vertex paths and add the missing faces depending your mouse position. You can find a useful video here: vimeo.com/57686760 $\endgroup$ – parameciostudio Sep 14 '15 at 18:38
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In edit mode, with vertex select, (not edge select)

  • select the two vertices
  • menu [merge at center].
  • grab and place the vertex in the desired location.
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