Companies expect seasonal rise ahead of construction season.

Traders reportedly hiking prices to match asking prices for imported cement.

Cement makers point to higher transportation costs for impending increase.

Local trade groups note double digit decline in output, as industry continues to sag.

Output up more than a quarter in the first three months of the year.

Bricks and building block production also fell for the period.

Traders say lower demand in the market contributed to the decrease.

Consumption falls 40% during the period, as construction weakness persists.

Caboco says plants can add 3,700 tons of production per day.

Analysts note marginal increase in prices for the country's cement makers.