Kingspan plans to use 500 million recycled plastic bottles a year in its insulation products by 2023.
And by 2025, the building materials manufacturer aims to double this to one billion.
The initiative is part of a broader programme from the group to produce its products in a low-carbon and environmentally responsible way.
Kingspan is already manufacturing insulation using recycled plastics.
But, from today, it will add plastic recovered from the oceans to its production chain.
To achieve its target, Kingspan has partnered with the EcoAlf Foundation.
Under a three-year agreement between the two, Kingspan will help to remove up to 150 tonnes of waste from the Mediterranean annually through the EcoAlf Foundation's network of fishermen.