Con­struc­tion accor­ding to the P1 puri­ty class

In Fin­land the puri­ty class P1 of the con­struc­tion pro­ject aims to ensu­re that the pre­mi­ses of the finis­hed buil­ding are clean when it is han­ded over to the cus­to­mer. At the same time, impu­ri­ties from the con­struc­tion pha­se are pre­ven­ted from ente­ring the indoor air during the use of the buil­ding. When a deve­lo­per aims for the S1 or S2 indoor air qua­li­ty class, the pro­ject must be car­ried out in accor­dance with the so cal­led P1 puri­ty stan­dards. P1 con­struc­tion is not dif­ficult as long as you know what you are doing.

The deve­lo­per sets indoor air qua­li­ty tar­gets for the con­struc­tion pro­ject. He/​she pre­sents the solu­tions desig­ned to reach the goal to the desig­ner and cont­rac­tor at the site start-up mee­ting.

The main cont­rac­tor must make a pro­ject-speci­fic P1 dust cont­rol plan. Its goal is to impro­ve dust cont­rol at the site. The plan takes into account the abo­ve requi­re­ments for indoor air qua­li­ty and puri­ty of con­struc­tion work. It desc­ri­bes the principles and prac­tices of dust cont­rol and gui­des the work of all site cont­rac­tors. Trai­ning will ensu­re that the main com­po­nents of P1 con­struc­tion are con­si­de­red.

The work super­vi­sor must gui­de the con­struc­tion work, clea­ning and sto­ra­ge of the mate­rials so that the puri­ty requi­re­ments are met.

Sta­ges of P1 puri­ty class con­struc­tion

Dust pre­ven­tion

Dust is pre­ven­ted by acti­ve dust cont­rol, such as a source ext­rac­tion devices or a dust cont­rol work sta­tion, like Con­sair CAMU. Dust and con­ta­mi­nants are cont­rol­led at the site when and whe­re they are for­med. The dust is pic­ked up befo­re the small and dan­ge­rous par­ticles in it spread to tar­nish the work space. At the same time, their access to the breat­hing air of the wor­ker and thus to the alveo­li is pre­ven­ted.

Dust cont­rol

The sprea­ding of dust that has beco­me air-bor­ne des­pi­te the acti­ve dust cont­rol met­hods is mana­ged by pas­si­ve dust cont­rol. Mec­ha­nical ven­ti­la­tion is clo­sed and ducts in work areas are bloc­ked. Con­tain­ment zones and nega­ti­ve pres­su­re are key to pas­si­ve dust cont­rol. Nega­ti­ve pres­su­re units with HEPA fil­ters are used. The dust con­tent of the space can be cont­rol­led by air puri­fiers.

Mate­rial pro­tec­tion

Con­struc­tion mate­rials are pro­tec­ted against mois­tu­re and con­ta­mi­na­tion during trans­por­ta­tion, inter­me­dia­te sto­ra­ge and ins­tal­la­tion.

Con­struc­tion site clea­ning

Clean­li­ness is main­tai­ned regu­lar­ly by clea­ning. The brush must not be used in the P1 class, only scra­pers and vacuum clea­ners. Was­te mate­rial is sor­ted at the place of ori­gin in was­te bins or sacks, which should be trans­fer­red to the was­te col­lec­tion point as dust­less as pos­sible. From now on, the site must be kept at the P1 puri­ty level. Read more about P1 class clea­ning.

Final clea­ning

Befo­re the subsc­ri­ber recei­ves the comple­te buil­ding, the level of puri­ty that the subsc­ri­ber ori­gi­nal­ly set as the tar­get when they star­ted the pro­ject must be attai­ned in the final clea­ning.

Assess­ment of puri­ty

Befo­re the buil­ding is han­ded over, all visible sur­faces and inte­rior sur­faces of the fur­nis­hings are eva­lua­ted. Thres­hold values of 1–5% are set for allowed dust depo­sits.