diff --git a/src/components/LadderOrder.vue b/src/components/LadderOrder.vue
index ed7ec42..ff6f463 100644
--- a/src/components/LadderOrder.vue
+++ b/src/components/LadderOrder.vue
@@ -29,8 +29,9 @@ import {useOrderStore} from "@/store/store";
 import LimitPrice from "@/components/LimitPrice.vue";
 import Order from "@/components/Order.vue";
 import {computed, ref} from "vue";
-import {applyLimit, maxFraction} from "@/orderbuild.js";
+import {applyLimit} from "@/orderbuild.js";
 import {validateRequired, validateTranches} from "@/validate.js";
+import {MAX_FRACTION, newTranche} from "@/blockchain/orderlib.js";
 
 const os = useOrderStore()
 
@@ -79,12 +80,12 @@ const amounts = computed( ()=>fractions.value.map((f)=>f*os.totalAmount) )
 function buildTranches() {
   const ts = []
   const n = os.tranches
-  const mf = Number(maxFraction)
   for( let i=0; i<n; i++ ) {
     // todo optional deadline
-    const cs = [applyLimit(rungs.value[i])]
-    const fraction = Math.min(mf, Math.ceil(mf * fractions.value[i]) )
-    ts.push([fraction, cs])
+    const fraction = Math.min(MAX_FRACTION, Math.ceil(MAX_FRACTION * fractions.value[i]) )
+    const tranche = newTranche({fraction})
+    applyLimit(tranche, rungs.value[i])
+    ts.push(tranche)
   }
   return ts
 }
diff --git a/src/orderbuild.js b/src/orderbuild.js
index 42951ba..19975f1 100644
--- a/src/orderbuild.js
+++ b/src/orderbuild.js
@@ -1,6 +1,7 @@
 import {routeInverted} from "@/misc.js";
 import {MAX_FRACTION, newTranche} from "@/blockchain/orderlib.js";
 import {useOrderStore} from "@/store/store.js";
+import {encodeIEE754} from "@/blockchain/common.js";
 
 
 export function applyLimit(tranche, price=null) {
@@ -15,7 +16,7 @@ export function applyLimit(tranche, price=null) {
     const isAbove = os.limitIsMinimum ^ inverted
     const isRatio = false // todo ratios
     const decimals = 10 ** (os.tokenA.decimals - os.tokenB.decimals)
-    const limit = inverted ? decimals / price : price / decimals
+    const limit = encodeIEE754(inverted ? decimals / price : price / decimals)
     tranche.marketOrder = false;
     if( isAbove ) {
         tranche.minIntercept = limit;