Hello, I greatly appreciate your advice and recommendations in advance. Ok, so let me start by providing some highlights of what's happening. The settlement issue was identified while trying to replace our original ladder anchors that were badly damaged from the Michigan weather conditions over the years. The anchors were removed using a 3" core drill bit. The holes exposed an 8-10 inch backfill void below the 4" concrete decking. The extent of the void is unknown as I can only feel or see about 8-10 inch diameter inside the holes. There are no obvious concrete cracks or major damage visually above group besides some minor heaving with the slabs at the joints where the pool deck joins our previously poured patio. FYI, a few years ago I installed a drainage tile along the exterior of the pool deck away from the house after the original slabs caved in from runoff from my landscape grade.
Potential options:
1a) Drill 1" holes around the entire pool deck every 4-6 feet to identify all settlement issues
1b) Pour/inject backfill material (not sure what process or material is recommended) up to current cement level
1c) Install new ladder anchors and ladders
1d) Use cement saw to cutout and install drainage/channel tile to properly drain water to attach to existing basin in backyard
or
2a) Remove/replace all existing cement slabs on house-side of pool (about 45-50' x 4') to expose all damage area
2b) Backfill and
Highlights:
1) Fiberglass pool 42' x 16'
2) 10-11 years old
3) SWG
4) Pool deck - all concrete from pool to house (about 20' from house to closest pool edge)
5) We live in Michigan with heavy concentration of clay soil and are miles away from any major water source
Pictures:
1) Picture of drainage tile installed on far side of pool
2) Deep-end ladder holes exposing the 8" void
3) Joint damage/expansion between patio and pool cement decks at shallow end (patio is raised about 6" higher and is 20 feet long)
4) Partial pool picture
Potential options:
1a) Drill 1" holes around the entire pool deck every 4-6 feet to identify all settlement issues
1b) Pour/inject backfill material (not sure what process or material is recommended) up to current cement level
1c) Install new ladder anchors and ladders
1d) Use cement saw to cutout and install drainage/channel tile to properly drain water to attach to existing basin in backyard
or
2a) Remove/replace all existing cement slabs on house-side of pool (about 45-50' x 4') to expose all damage area
2b) Backfill and
Install drainage system
2c)
2d) 2c)
Drill 1" holes around the remaining pool deck and fill needed areas with recommended material
Replace cement decking
2e) Install new ladder anchors and ladders
2e) Install new ladder anchors and ladders
Highlights:
1) Fiberglass pool 42' x 16'
2) 10-11 years old
3) SWG
4) Pool deck - all concrete from pool to house (about 20' from house to closest pool edge)
5) We live in Michigan with heavy concentration of clay soil and are miles away from any major water source
Pictures:
1) Picture of drainage tile installed on far side of pool
2) Deep-end ladder holes exposing the 8" void
3) Joint damage/expansion between patio and pool cement decks at shallow end (patio is raised about 6" higher and is 20 feet long)
4) Partial pool picture
