What I want to know is about the "point of condensation". Important to
keep the point outside rather than inside the wall.

][<en


[log in to unmask] wrote:

> *In a message dated 8/1/2003 9:07:31 AM Eastern Daylight Time,
> [log in to unmask] writes:
>
> *
>
>> Here's a reference I just found that I think exhonerates you and
>> shows how ignorant others (me) are:
>>     No mortar drippings should be allowed in the wythe between the
>> back of the stone and the face of back-up structure.
>
>
> *
> Depends.  If we're talking about a solid masonry, and particularly a
> solid rubble, wall, you want all joints full of mortar to keep the
> wall as close to monolithic as possible and prevent it from falling apart.
>
> If we're talking about a cavity wall, which is theoretically designed
> _and_constructed to drain water that penetrates the outer wythe of
> masonry and keep it away from the interior, then you want the vertical
> joint (known as a collar joint) between inner and outer wythes to be
> free of mortar snots (legitimate technical term, for a change) so that
> the water runs down the cavity on the inside face of the outer wythe
> and drains to the exterior through weepholes (to the exterior) at the
> bottom of the wall.   The cavity wall requires flashing at various
> locations to make sure that water running down is directed outwards,
> rather than inwards (where we don't want it).
>
> Ralph*

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