Pool Finish - Revision history

Matt Parnell at 12:43, 2 September 2022

2022-09-02T12:43:27Z

← Older revision		Revision as of 12:43, 2 September 2022
Line 1:		Line 1:
	~~Marcite is~~ the pool~~'s smooth plaster~~ finish. ~~Often~~, ~~the terms~~ "marcite" ~~and "plaster" are used interchangeably~~. Marcite is a mixture of Portland cement, marble dust, and fortifying additives. ~~Optionally, silica~~ and quartz aggregate may be mixed in to improve appearance and durability.		This page covers various details regarding the pool finish. Originally, this page referred to "marcite", the finish present before September 2022. Marcite is a mixture of Portland cement, marble dust, and fortifying additives. Silica and quartz aggregate may be mixed in to improve appearance and durability.

	== Maintenance ==		== Maintenance ==

	Basic principles should be followed to ~~aide~~ in the longevity of the ~~marcite~~:		Basic principles should be followed to aid in the longevity of the pool finish:

	* Keep chemicals in balance at all times. Unbalanced pool chemistry may result in "spot etching" of the ~~marcite~~ finish.		* Keep chemicals in balance at all times. Unbalanced pool chemistry may result in "spot etching" of the finish.
	* Avoid acid washing wherever possible. Covering the pool off-season greatly reduces the need to acid wash.		* Avoid acid washing wherever possible. Covering the pool off-season greatly reduces the need to acid wash.

	== Patching ==		== Patching ==

	Patching of holes may periodically be needed, especially as the ~~marcite~~ finish ages. Assume $300-500 per hole patched, though this number is very much subject to change. The contractor requires the water temperature to be above 75 degrees (presumably for the sake of the divers). This, of course, is ~~mostly~~ relevant for work in the early season before the boiler is operating. After a patch, allow at least 24 hours to cure before opening the area to swimmers.		Patching of holes may periodically be needed, especially as the finish ages. Assume $300-500 per hole patched, though this number is very much subject to change. The contractor requires the water temperature to be above 75 degrees (presumably for the sake of the divers). This, of course, is most relevant for work in the early season before the boiler is operating. After a patch, allow at least 24 hours to cure before opening the area to swimmers.

	== Replacement ==		== Replacement ==

	In the past, marcite was usually only repaired. Problem spots were removed and a new bond coat and plaster (marcite) were placed over old. As a result, refinished pools may contain many layers. For the next replacement (2022), these layers will mostly need to be removed. This aligns with the recommendations of the [https://www.npconline.org/ National Plasterers Council].		In the past, marcite was usually only repaired. Problem spots were removed, and a new bond coat and plaster (marcite) were placed over old. As a result, refinished pools may contain many layers. For the next replacement (2022), these layers will mostly need to be removed. This aligns with the recommendations of the [https://www.npconline.org/ National Plasterers Council].

	=== Plan for 2022 ===		=== Plan for 2022 ===

	Replacement of the pool finished is planned for 2022. Work is planned to commence as quickly as possible following the pool closure to members (Tuesday after Labor Day). The pool will need to be chemically treated for about 30 days following job completion to allow the finish to fully and properly cure.		Replacement of the pool finished is planned for September 6th, 2022. Work is planned to commence as quickly as possible following the pool closure to members (Tuesday after Labor Day). The pool will need to be chemically treated for about 30 days following job completion to allow the finish to fully and properly cure.

	Quotes were originally in late season 2020 for budgetary purposes. Updated quotes were obtained for 2022. Due to the potentially sensitive nature of the pricing, the details are not included here. B&G has full records on file.		Quotes were originally in late season 2020 for budgetary purposes. Updated quotes were obtained for 2022. Due to the potentially sensitive nature of the pricing, the details are not included here. B&G has full records on file.

	~~There are some~~ additional items ~~that~~ will be associated with this project:		Some additional items will be associated with this project:

	* The replacement of the filter sand and tank internals (see this [[Sand Filters#Replacement of Sand\|link]]). For budget reasons, this is planned to be deferred to 2023, ~~prior to~~ the opening of the pool.		* The replacement of the filter sand and tank internals (see this [[Sand Filters#Replacement of Sand\|link]]). For budget reasons, this is planned to be deferred to 2023, before the opening of the pool.
	* The replacement of light fixture niche(s) and at least one fixture (as lights will have to be pulled during the work anyhow). Conversion to LED is being considered.		* The replacement of light fixture niche(s) and at least one fixture (as lights will have to be pulled during the work anyhow). Conversion to LED is being considered.
	* Piping work that can only be completed when the pool is drained:		* Piping work that can only be completed when the pool is drained:
	** Replacement of 6" isolation valves on main drain line in pump house.		** Replacement of 8" isolation valves on main drain line in the pump house.
	** Installation of a ~~spring-return electrically controlled~~ valve on the main drain line (for surge tank modulation).		** Installation of a motorized valve on the main drain line (for surge tank modulation).

	=== Requirements ===		=== Requirements ===
Line 48:		Line 48:

	* A warranty period of at least one year. Two years appear to be standard for a quartz aggregate finish.		* A warranty period of at least one year. Two years appear to be standard for a quartz aggregate finish.
	* Local references		* Local references.
	* ~~Verification of~~ insurance, per standard practice when [[Board_Building_and_Grounds#Hiring_Contractors\|hiring contractors]]		* Verified insurance, per standard practice, when [[Board_Building_and_Grounds#Hiring_Contractors\|hiring contractors]].

	Ideally, the contractor should NOT utilize a sub-contractor. This will add cost. The job is estimated to take 2-3 weeks to complete ~~in total~~.		Ideally, the contractor should NOT utilize a sub-contractor. This will add cost. The job is estimated to take 2-3 weeks to complete.

	=== Preparation ===		=== Preparation ===

	Static pressure due to groundwater is a concern. Hydrostats from the main drain ~~swill~~ need to be removed and the contractor may also need to drill additional pressure relief holes. Well point dewatering is not planned.		Static pressure due to groundwater is a concern. Hydrostats from the main drain will need to be removed, and the contractor may also need to drill additional pressure relief holes. Well point dewatering is not planned.

	The current best practice is to strip as many layers as possible. The stairs should be stripped, too. This may result in some corners of the gunite breaking off. The stairs may need to be ~~re-built~~ as a result. This may be desirable, as the stairs are presently slightly sloped downwards		The current best practice is to strip as many layers as possible. The stairs should be stripped, too. This may result in some corners of the gunite breaking off. The stairs may need to be rebuilt as a result. This may be desirable, as the stairs are presently slightly sloped downwards

	=== Engineering Support ===		=== Engineering Support ===

Matt Parnell at 13:49, 26 February 2022

2022-02-26T13:49:51Z

← Older revision		Revision as of 13:49, 26 February 2022
Line 18:		Line 18:
	=== Plan for 2022 ===		=== Plan for 2022 ===

	As of the ~~2020/2021 seasons, the plan~~ is ~~to complete marcite replacement in the fall of~~ 2022. Work is planned to commence as quickly as possible following the pool closure to members (~~perhaps the~~ Tuesday after Labor Day). The pool will need to be ~~chemical~~ treated ~~and heated~~ for 30 days following job completion to allow the ~~marcite~~ to fully and properly cure.		Replacement of the pool finished is planned for 2022. Work is planned to commence as quickly as possible following the pool closure to members (Tuesday after Labor Day). The pool will need to be chemically treated for about 30 days following job completion to allow the finish to fully and properly cure.

	~~Preliminary quotes for the job~~ were ~~obtained~~ in late season 2020 for budgetary purposes. Due to the potentially sensitive nature of the pricing, the details are not included here. B&G has full records on file~~. Pricing was adjusted/estimated as best as possible to include expected increases for 2022~~.		Quotes were originally in late season 2020 for budgetary purposes. Updated quotes were obtained for 2022. Due to the potentially sensitive nature of the pricing, the details are not included here. B&G has full records on file.

	There are some additional items that will be associated with this project:		There are some additional items that will be associated with this project:

	* ~~Replacement~~ of the filter sand ~~after the curing process has completed~~ (see this [[Sand Filters#Replacement of Sand\|link]]).		* The replacement of the filter sand and tank internals (see this [[Sand Filters#Replacement of Sand\|link]]). For budget reasons, this is planned to be deferred to 2023, prior to the opening of the pool.
	* ~~Replacement~~ of light fixture niche(s) and at least one fixture (as lights will have to be pulled during the work anyhow). Conversion to LED?		* The replacement of light fixture niche(s) and at least one fixture (as lights will have to be pulled during the work anyhow). Conversion to LED is being considered.
	* Piping work that can only be completed when the pool is drained:		* Piping work that can only be completed when the pool is drained:
	** Replacement of 6" isolation valves on main drain line in pump house.		** Replacement of 6" isolation valves on main drain line in pump house.
Line 34:		Line 34:
	Contractors quoting marcite replacement should include:		Contractors quoting marcite replacement should include:

	* A marcite ~~only and/~~or ~~marcite plus~~ quartz finish (preferred for improved durability over marcite ~~only~~). A pebble finish is not currently being considered.		* A marcite or quartz aggregate finish (preferred for improved durability over marcite). A pebble finish is not currently being considered.
	** Finish to 3/8" to 1/2" thickness (some variation due to imperfect gunite finish expected).		** Finish to 3/8" to 1/2" thickness (some variation due to imperfect gunite finish expected).
	* Chip and/or waster blast strip preparation. The former is more common. Some companies will do a full strip (down to gunite), while others recommend stripping at least two layers (the more the better, in general).		* Chip and/or waster blast strip preparation. The former is more common. Some companies will do a full strip (down to gunite), while others recommend stripping at least two layers (the more the better, in general).
Line 47:		Line 47:
	Additional requirements:		Additional requirements:

	* A warranty period of at least one year. Two years ~~appears~~ to be standard for a ~~marcite plus~~ quartz finish.		* A warranty period of at least one year. Two years appear to be standard for a quartz aggregate finish.
	* Local references		* Local references
	* Verification of insurance, per standard practice when [[Board_Building_and_Grounds#Hiring_Contractors\|hiring contractors]]		* Verification of insurance, per standard practice when [[Board_Building_and_Grounds#Hiring_Contractors\|hiring contractors]]
Line 55:		Line 55:
	=== Preparation ===		=== Preparation ===

	Static pressure due to ~~ground water~~ is a concern. Hydrostats from the main drain swill need to be removed and the contractor may also need to drill additional pressure relief holes. Well point dewatering is not planned.		Static pressure due to groundwater is a concern. Hydrostats from the main drain swill need to be removed and the contractor may also need to drill additional pressure relief holes. Well point dewatering is not planned.

	The current best practice is to strip as many layers ~~of marcite~~ as possible. The stairs should be stripped, too. This may result in some corners of the gunite breaking off. The stairs may need to be re-built as a result. This may be desirable, as the stairs are presently slightly sloped downwards		The current best practice is to strip as many layers as possible. The stairs should be stripped, too. This may result in some corners of the gunite breaking off. The stairs may need to be re-built as a result. This may be desirable, as the stairs are presently slightly sloped downwards

	=== Engineering Support ===		=== Engineering Support ===

	It has been suggested that an engineering firm is not required for this project. The biggest concern for any contractor is dealing with ~~the~~ hydrostatic pressure.		It has been suggested that an engineering firm is not required for this project. The biggest concern for any contractor is dealing with hydrostatic pressure.

	=== Curing Process ===		=== Curing Process ===

Matt Parnell: Matt Parnell moved page Pool Marcite to Pool Finish: The pool finish will not necessarily be marcite - likely a quartz mix.

2022-02-26T13:45:13Z

Matt Parnell moved page Pool Marcite to Pool Finish: The pool finish will not necessarily be marcite - likely a quartz mix.

← Older revision	Revision as of 13:45, 26 February 2022
(No difference)

Matt Parnell: /* Curing Process */

2021-10-21T00:36:39Z

Curing Process

← Older revision		Revision as of 00:36, 21 October 2021
Line 65:		Line 65:
	=== Curing Process ===		=== Curing Process ===

	* Fill the pool to the proper level as quickly as possible to minimize shrinkage.		* Fill the pool to the proper level as quickly as possible to minimize shrinkage. This must be completed within 24 hours (within the day if the weather is hot).
	* A metal sequestering agent may need to be added to the pool - verify with the contractor.		* A metal sequestering agent may need to be added to the pool - verify with the contractor.
	* Chemicals must be balanced as quickly as possible to protect the new finish.		* Chemicals must be balanced as quickly as possible to protect the new finish.

Matt Parnell at 13:24, 26 August 2021

2021-08-26T13:24:32Z

← Older revision		Revision as of 13:24, 26 August 2021
Line 1:		Line 1:
			Marcite is the pool's smooth plaster finish. Often, the terms "marcite" and "plaster" are used interchangeably. Marcite is a mixture of Portland cement, marble dust, and fortifying additives. Optionally, silica and quartz aggregate may be mixed in to improve appearance and durability.

	== Maintenance ==		== Maintenance ==

			Basic principles should be followed to aide in the longevity of the marcite:

	* Keep chemicals in balance at all times. Unbalanced pool chemistry may result in "spot etching" of the marcite finish.		* Keep chemicals in balance at all times. Unbalanced pool chemistry may result in "spot etching" of the marcite finish.

Matt Parnell at 12:21, 26 August 2021

2021-08-26T12:21:57Z

← Older revision		Revision as of 12:21, 26 August 2021
Line 17:		Line 17:

	Preliminary quotes for the job were obtained in late season 2020 for budgetary purposes. Due to the potentially sensitive nature of the pricing, the details are not included here. B&G has full records on file. Pricing was adjusted/estimated as best as possible to include expected increases for 2022.		Preliminary quotes for the job were obtained in late season 2020 for budgetary purposes. Due to the potentially sensitive nature of the pricing, the details are not included here. B&G has full records on file. Pricing was adjusted/estimated as best as possible to include expected increases for 2022.

			There are some additional items that will be associated with this project:

			* Replacement of the filter sand after the curing process has completed (see this [[Sand Filters#Replacement of Sand\|link]]).
			* Replacement of light fixture niche(s) and at least one fixture (as lights will have to be pulled during the work anyhow). Conversion to LED?
			* Piping work that can only be completed when the pool is drained:
			** Replacement of 6" isolation valves on main drain line in pump house.
			** Installation of a spring-return electrically controlled valve on the main drain line (for surge tank modulation).

	=== Requirements ===		=== Requirements ===

Matt Parnell: /* Patching */

2021-08-26T12:13:33Z

Patching

← Older revision		Revision as of 12:13, 26 August 2021
Line 6:		Line 6:
	== Patching ==		== Patching ==

	Patching of holes may periodically be needed, especially as the marcite finish ages. Assume $300-500 per hole patched, though this number is very much subject to change.		Patching of holes may periodically be needed, especially as the marcite finish ages. Assume $300-500 per hole patched, though this number is very much subject to change. The contractor requires the water temperature to be above 75 degrees (presumably for the sake of the divers). This, of course, is mostly relevant for work in the early season before the boiler is operating. After a patch, allow at least 24 hours to cure before opening the area to swimmers.

	The contractor requires the water temperature to be above 75 degrees (presumably for the sake of the divers). This, of course, is mostly relevant for work in the early season before the boiler is operating.

	After a patch, allow at least 24 hours to cure before opening the area to swimmers.

	== Replacement ==		== Replacement ==

Matt Parnell: /* Patching */

2021-08-26T12:13:16Z

Patching

← Older revision		Revision as of 12:13, 26 August 2021
Line 5:		Line 5:

	== Patching ==		== Patching ==

			Patching of holes may periodically be needed, especially as the marcite finish ages. Assume $300-500 per hole patched, though this number is very much subject to change.

			The contractor requires the water temperature to be above 75 degrees (presumably for the sake of the divers). This, of course, is mostly relevant for work in the early season before the boiler is operating.

			After a patch, allow at least 24 hours to cure before opening the area to swimmers.

	== Replacement ==		== Replacement ==

Matt Parnell: /* Replacement */

2021-08-26T12:05:11Z

Replacement

← Older revision		Revision as of 12:05, 26 August 2021
Line 8:		Line 8:
	== Replacement ==		== Replacement ==

			In the past, marcite was usually only repaired. Problem spots were removed and a new bond coat and plaster (marcite) were placed over old. As a result, refinished pools may contain many layers. For the next replacement (2022), these layers will mostly need to be removed. This aligns with the recommendations of the [https://www.npconline.org/ National Plasterers Council].

	=== Plan for 2022 ===		=== Plan for 2022 ===
Line 41:		Line 41:
	=== Preparation ===		=== Preparation ===

	~~The current best practice~~ is to ~~strip as many layers of marcite as possible~~.		Static pressure due to ground water is a concern. Hydrostats from the main drain swill need to be removed and the contractor may also need to drill additional pressure relief holes. Well point dewatering is not planned.

	The stairs should be stripped, too. This may result in some corners of the gunite breaking off. The stairs may need to be re-built as a result. This may be desirable, as the stairs are presently slightly sloped downwards		The current best practice is to strip as many layers of marcite as possible. The stairs should be stripped, too. This may result in some corners of the gunite breaking off. The stairs may need to be re-built as a result. This may be desirable, as the stairs are presently slightly sloped downwards

	=== Engineering Support ===		=== Engineering Support ===

Matt Parnell: /* Requirements */

2021-08-26T11:58:27Z

Requirements

← Older revision		Revision as of 11:58, 26 August 2021
Line 35:		Line 35:
	* A warranty period of at least one year. Two years appears to be standard for a marcite plus quartz finish.		* A warranty period of at least one year. Two years appears to be standard for a marcite plus quartz finish.
	* Local references		* Local references
	* Verification of insurance.		* Verification of insurance, per standard practice when [[Board_Building_and_Grounds#Hiring_Contractors\|hiring contractors]]

	Ideally, the contractor should NOT utilize a sub-contractor. This will add cost. The job is estimated to take 2-3 weeks to complete in total.		Ideally, the contractor should NOT utilize a sub-contractor. This will add cost. The job is estimated to take 2-3 weeks to complete in total.