Holcim and Lafarge, with combined sales of 32 billion euro, said the merger plan was unanimously approved by their Boards and fully supported by their core shareholders.
"The proposed merger would enable optimised capital allocation across the expanded footprint and strong cash-flow generation and the robust balance sheet that will provide financial strength," the two firms said in a joint statement.
The new entity, LafargeHolcim, will be headquartered in Switzerland and will have Holcim's Chairman designate Wolfgang Reitzle as Group Chairman. Bruno Lafont, Lafarge's Chief executive, will take over as the CEO of the combined group.
LafargeHolcim will have enhanced presence in the global building materials sector with number one position worldwide across cement, concrete and aggregates and new opportunities to optimise production and commercial networks, it added.
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"After a strategic optimisation of the portfolio through a pro-active divestment process, in anticipation of regulatory requirements, LafargeHolcim would occupy complementary positions," it said.
LafargeHolcim will be listed on the SIX in Zurich and Euronext Paris.
"The proposed combination would be structured as a public offer filed by Holcim for all outstanding shares of Lafarge on the basis of a 1 for 1 exchange ratio with an agreement to have equal dividends on a per share basis between announcement and completion," it said.
The deal is likely to be closed in the first half of 2015.