Originally surveys did not yield furniture mats because people saved 100s of surveys to quickly amass furniture mats on the release of Homestead.
It has been a long time since then though so:
1. Allow the existing surveys to drop furniture mats
or
2. Add a Daily Furniture crafting writ (that needs 2-3 pieces of white quality furniture) that rewards furniture mats and chance at a survey that leads to a furniture mat stash.
Just make it a little easier for us to get mats for furniture crafting
Right now Mundane Runes are driving me crazy!