Steven i think you will find that its been a very rare practise to put a "turn" on the bottom step nowadays and has been for over ten years! Custys do not want to see marks where nails have been hit in. Gripperrod (tradename) or smoothedge is the norm-even on axminster carpets. Provided the carpet has been "sized" beforehand to prevent fraying then its gripper all the way down and a piece left over to replace the whole step should wear take place. Also most new houses have a "bullnose" bottom step which is capped and banded and is very hard to peel back. By looking at the underlay in the hallway you are not getting a good indicator of wear as its the nosings of stairs that wear out and this is where this carpet is apparently blackening.
Regards Damian
Damian, with all respect what you have written is nonsense and misleading.
1. I am part of a large fitting team with 32 years experience and if fitters are not putting a turn on the bottom step when fitting axminsters or wiltons then there doing the customer out of years of wear on the stairs. Todays fitters are not craftsmen they just throw the carpet down half the time.
2. When you do a turn, you don't do it on the bullnose but on the bottom straight step.
3. When you pin a turn the pins are placed every half inch along the bottom of the step so you can't see it and you cant see the indentations or pin heads if done correctly and neatly.
4. You say that a piece is usually left over to replace the whole step. What if the carpet is patterned then you can't do this. When you 'change a tread' what your doing is moving the tread part up 6-8 inches so its now on the riser and the good part which was on the riser is now on the tread.
5. 70% of houses I fit have bullnoses which are always capped and banded and they are also pinned under the nosing and banded using spray adhesive and pins to make sure they are thoroughly secure.
6. Members should not attempt to release and refit carpet on stairs unless they have the correct tools and know what they are doing for reasons Ive mentioned in my other post.
7. Pulling back part of the hallway carpet just below the stairs is sufficient indication as to see what the underlay is like, condition etc. You will know that there is a problem on the stairs just by feeling the underlay. Its flat, soily, gritty, powdery, discolored and has no bounce.
Like I stated, get an independent fitting company in to make a full report.
I've only been on the forum for a few days but some of the misinformation is incredible.